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Author name code: pecker
ADS astronomy entries on 2022-09-14
author:"Pecker, Jean-Claude"
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Title: With the IAU and inside the IAU since 1946
Authors: Pecker, Jean-Claude
2019IAUS..349..112P Altcode:
In this presentation the author narrates some key episodes of his life
of serving the IAU for more than seventy years.
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Title: The local contribution to the microwave background radiation
Authors: Pecker, Jean-Claude; Narlikar, Jayant V.; Ochsenbein,
Francois; Wickramasinghe, Chandra
2015RAA....15..461P Altcode:
The observed microwave background radiation (MBR) is commonly
interpreted as the relic of an early hot universe, and its observed
features (spectrum and anisotropy) are explained in terms of properties
of the early universe. Here we describe a complementary, even possibly
alternative, interpretation of MBR, first proposed in the early
20<SUP>th</SUP> century, and adapt it to modern observations. For
example, the stellar Hipparcos data show that the energy density
of starlight from the Milky Way, if suitably thermalized, yields a
temperature of ∼2.81 K. This and other arguments given here strongly
suggest that the origin of MBR may lie, at least in a very large part,
in re-radiation of thermalized galactic starlight. The strengths and
weaknesses of this alternative radical explanation are discussed.
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Title: Paul couteau (1923-2014)
Authors: Pecker, J. C.; Bonneau, D.; Durand, P.; Gili, R.; Soulié,
E.; Thorel, J. C.
2014O&T....83...32P Altcode:
Fascinated by astronomy in adolescence, Paul Couteau made solid literary
studies up to bachelor and then scientific studies. He prepares his
doctoral dissertation on the white dwarfs under the supervision of
Evry Schatzman. In 1951, he becomes an assistant astronomer at the
Nice Observatory. Robert Jonckheere gives him a practical training as
an observer of visual double stars (VDS). From that epoch, he started
to accumulate measures. In 1961, he spends six months at the Yerkes
Observatory with George Van Biesbroeck. From 1963 to 1969, he directs
the renovation of the large refractor at the Nice Observatory. He
chairs the Double Stars (DS) Commission of the IAU and, in 1969,
he organizes an international symposium on DS. Having undertaken a
sky survey, he accumulates discoveries of VDS. By the numbers of his
measurements and of his discoveries, he is the eighth observer of
history of DS. Laureate of the Janssen prize of SAF, Paul Couteau is
also a teacher and a writer, who published five books.
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Title: Einar Tandberg-Hanssen
Authors: Schmieder, Brigitte; Pecker, Jean-Claude; Gary, Allen; Wu,
S. T.; Moore, Ronald; Biesmann, Else
2014IAUS..300....4S Altcode:
I would like to report first on the scientific career of Einar
Tandberg-Hanssen: how he became a Solar Physicist particularly
interested in prominences. In the second part of my talk I will show
what he brought to the French community from the science perspective.
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Title: The Influence of the Active Sun on the Climatic Perturbations
Authors: Pecker, J. -C.
2012POBeo..91..347P Altcode:
The particles of the solar wind and those emerging from solar active
regions do not carry enough energy to influence the global climate of
the Earth; but they may influence, through their geomagnetic effects,
the perturbations of the climate w.r. to its global behaviour,
as demonstrated by using the relations between solar activity and
precipitation rates. That remark leads naturally to ask a more general
question: is the changing geomagnetic field influencing the climatic
perturbations?
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Title: Current Issues in Cosmology
Authors: Pecker, Jean-Claude; Narlikar, Jayant
2011cic..book.....P Altcode:
Part I. Observational Facts Relating to Discrete Sources: 1. The
state of cosmology G. Burbidge; 2. The redshifts of galaxies
and QSOs E. M. Burbidge and G. Burbidge; 3. Accretion discs in
quasars J. Sulentic; Part II. Observational Facts Relating to
Background Radiation: 4. CMB observations and consequences F. Bouchet;
5. Abundances of light nuclei K. Olive; 6. Evidence for an accelerating
universe or lack of A. Blanchard; Part III. Standard Cosmology:
7. Cosmology, an overview of the standard model F. Bernardeau;
8. What are the building blocks of our universe? K. C. Wali; Part
IV. Large-Scale Structure: 9. Observations of large-scale structure
V. de Lapparent; 10. Reconstruction of large-scale peculiar velocity
fields R. Mohayaee, B. Tully and U. Frisch; Part V. Alternative
Cosmologies: 11. The quasi-steady state cosmology J. V. Narlikar;
12. Evidence for iron whiskers in the universe N. C. Wickramasinghe;
13. Alternatives to dark matter: MOND + Mach D. Roscoe; 14. Anthropic
principle in cosmology B. Carter; Part VI. Evidence for Anomalous
Redshifts: 15. Anomalous redshifts H. C. Arp; 16. Redshifts of
galaxies and QSOs: the problem of redshift periodicities G. Burbidge;
17. Statistics of redshift periodicities W. Napier; 18. Local abnormal
redshifts J.-C. Pecker; 19. Gravitational lensing and anomalous
redshifts J. Surdej, J.-F. Claeskens and D. Sluse; Panel discussion;
General discussion; Concluding remarks.
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Title: Camille Flammarion's observatory: towards a revival
Authors: Morel, P.; Pecker, J. C.; Flammarion, A.; Fuentes, P.;
Stépanoff, C. A.; Sol, R.; Dufour, G.; Chaufour, R.; Goury-Laffont, J.
2011IAUS..260E..35M Altcode:
Camille Flammarion's observatory, located in Juvisy-sur-Orge in the
suburbs of Paris, has been idle since 1962. Property of the Société
Astronomique de France (SAF), it was made available to the city of
Juvisy-sur-Orge since 1971, and contains a unique collection of objects
and books currently being sorted out. The observatory is being restored
by the SAF, thanks to the support of the city of Juvisy-sur-Orge, the
French Académie des Sciences and the “Amis de Camille Flammarion”
association. In 2006, the Maxime Goury Laffont foundation funded the
refurbishment of the 240 mm refractor and in 2007 funds were obtained to
restore the dome and central building. The main aim of the project is to
make this historical place a popular observatory dedicated to astronomy
and the sciences which Camille Flammarion enjoyed and contributed
to. It constitutes a unique example in France of synergies linking
associations, municipality, regional- and national-level institutions.
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Title: The Local Contribution to the Microwave Background
Radiation(MBR)
Authors: Narlikar, Jayant V.; Pecker, Jean-Claude; Wickramasinghe,
N. Ch.
2010vaoa.conf..259N Altcode:
In the early fifties, from the early theories of the big bang
universe, Gamow, Alpher & Herman have predicted the existence
of a "cosmological" microwave background radiation, corresponding to
a black body of a few Kelvins. When, in 1964, Penzias & Wilson,
observed a radiation at 2.7K, the scientific world concluded quickly
it was a proof, a final proof, of the big bang type cosmologies. But it
should be realized that, in the beginning of the XX-th century, several
authors, from Guillaume to Eddington, have predicted the same thing
in a static Universe. We have redone the calculations of Eddington,
and based them on the recent and very accurate photometric results
from the satellite Hipparcos. In the absence of any expansion, of any
big bang type behaviour, we compute the local temperature induced by
the reradiation by local matter of stellar radiation, and we found
it to be in excellent agreement with the observations. This result,
completed by a careful discussion, could lead to a dramatic revision
of the classical cosmological concepts.
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Title: Book Review: Un astronome des lumières. Jerôme Lalande -
Lettres &agrave: Mme Du Pierry at au juge Honoré Flaugergues
(Dumont and Pecker)
Authors: Brosche, Peter; Dumont, Simone; Pecker, J. -C.
2008AcHA...36..300B Altcode:
No abstract at ADS
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Title: In memoriam : Pierre Bacchus
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Title: In memoriam : Pierre
Bacchus
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Title: In memoriam : Pierre Bacchus
Authors: Dommanget, J.; Durand, P.; Pecker, J. C.; Savoie, D.;
Soulié, E.
2007O&T....67...45D Altcode:
An astronomer's life mainly devoted to double star astronomy
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Title: Current Issues in Cosmology
Authors: Pecker, Jean-Claude; Narlikar, Jayant
2006cic..book.....P Altcode:
Part I. Observational Facts Relating to Discrete Sources: 1. The
state of cosmology G. Burbidge; 2. The redshifts of galaxies
and QSOs E. M. Burbidge and G. Burbidge; 3. Accretion discs in
quasars J. Sulentic; Part II. Observational Facts Relating to
Background Radiation: 4. CMB observations and consequences F. Bouchet;
5. Abundances of light nuclei K. Olive; 6. Evidence for an accelerating
universe or lack of A. Blanchard; Part III. Standard Cosmology:
7. Cosmology, an overview of the standard model F. Bernardeau;
8. What are the building blocks of our universe? K. C. Wali; Part
IV. Large-Scale Structure: 9. Observations of large-scale structure
V. de Lapparent; 10. Reconstruction of large-scale peculiar velocity
fields R. Mohayaee, B. Tully and U. Frisch; Part V. Alternative
Cosmologies: 11. The quasi-steady state cosmology J. V. Narlikar;
12. Evidence for iron whiskers in the universe N. C. Wickramasinghe;
13. Alternatives to dark matter: MOND + Mach D. Roscoe; 14. Anthropic
principle in cosmology B. Carter; Part VI. Evidence for Anomalous
Redshifts: 15. Anomalous redshifts H. C. Arp; 16. Redshifts of
galaxies and QSOs: the problem of redshift periodicities G. Burbidge;
17. Statistics of redshift periodicities W. Napier; 18. Local abnormal
redshifts J.-C. Pecker; 19. Gravitational lensing and anomalous
redshifts J. Surdej, J.-F. Claeskens and D. Sluse; Panel discussion;
General discussion; Concluding remarks.
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Title: Preface (Current issues in cosmology)
Authors: Pecker, Jean-Claude; Narlikar, Jayant
2006cic..bookD...9P Altcode:
No abstract at ADS
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Title: Local abnormal redshifts
Authors: Pecker, Jean-Claude
2006cic..book..217P Altcode:
Observations of "abnormal" (non-Dopplerian) redshifts in the spectrum of
nearby sources (the Sun, binary stars, close-by galaxies in groups),
and of "abnormal light deflection in the vicinity of the Sun,"
are presented. Emphasis is given on the need of reconsidering the
observations, which have not been seriously considered since the
1970. During the early 1970s, Chip Arp started discovering several
cases of "abnormal" (i.e., non-Dopplerian) redshifts in the spectra of
extragalactic objects. It is one of the most important observational
discoveries of our times, in my opinion. At about the same time, I
became interested in the abnormal redshifts found in the spectrum of the
Sun. J.-P. Vigier, at the same time, was involved in understanding the
nature of the photon, along the lines defined by Louis de Broglie, and
he did not accept the idea of a zero rest-mass of the photon. We put our
efforts together, and we tried to link the abnormal redshifts observed
in the local, nearby, universe as consequences of some "tired-light"
mechanism, closely linked with the rest-mass of the photon, which we
assumed to be a "non-zero restmass," without actually knowing anything
else but an upper value of this rest-mass. I feel it is a need today
to remind the audience of these local, solar and others, abnormal
redshifts, although they were mentioned extensively several years
ago, but they were neither properly confirmed nor really accounted
for. Almost all relevant references can be found in our review paper
(Pecker 1977).
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Title: Stellar and extragalactic radiation at the Earth's surface.
Authors: Pecker, J. -C.; Narlikar, J. V.
2006JApA...27....1P Altcode:
Reviving a calculation made by Eddington in the 1920s, and using the
most recent and comprehensive databases available on stars and galaxies,
including more than 2,500,000 stars and around 20,000 galaxies we have
computed their total radiation received at the Earth just outside
its atmosphere. This radiation density, if thermalized, would be
equivalent to a temperature of 4.212 K. The comparability of this
temperature to that of the cosmic microwave background (2.723 K) may
either be a pure coincidence or may hold a key to some as yet unknown,
aspect of the universe.
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Title: De Versailles à Bilderberg, le soleil infrarouge
Authors: Pecker, J.
2006via..conf..375P Altcode:
After recalling the needs for the study of the Sun, as they appeared
in the 1960s, the beginning of space research in France and the birth
of the "Programme de Versailles (1957)" are evoked. This extension of
the observed spectrum, and the complementary aspects of ultraviolet and
infrared data, led to a general agreed reference model, the "Bilderberg
model" (1967). Infrared research then expanded quickly. This period
had seen the development of the carrier of our friend Pierre Léna,
a path which began with solar infrared astronomy.
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Title: Premiers développements de l'astronomie spatiale en France :
l'ultra-violet, (et l'infrarouge)
Authors: Pecker, Jean-Claude
2001ESASP.472...51P Altcode: 2001pesp.conf...51P
No abstract at ADS
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Title: Understanding the heavens : thirty centuries of astronomical
ideas from ancient thinking to modern cosmology
Authors: Pecker, Jean-Claude; Kaufman, Susan
2001uhtc.book.....P Altcode:
No abstract at ADS
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Title: Le Point sur... Astronomie IV
Authors: Pecker, J. -C.
2001lpsa....4.....P Altcode:
Cet ouvrage regroupe des articles de mise au point sollicités par
le rédacteur en chef de la rubrique Astronomie des Comptes rendus de
l'Académie des sciences. Les textes se proposent de faire découvrir
aux lecteurs, dans les principales disciplines de l'astronomie, les
résultats les plus remarquables des dernières années.Leurs auteurs
sont des spécialistes participant activement à l'accroissement
des connaissances dans des domaines faisant l'objet de recherches
intensives. Ces mises au point sur des questions particulièrement
importantes de l'astronomie sont rédigées soit en français, soit
en anglais et accompagnées d'une bibliographie détaillée.
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Title: Le Point sur... Astronomie III
Authors: Pecker, J. -C.
2001lpsa....3.....P Altcode:
Ce fascicule contient l'ensemble des textes du débat sur la cosmologie
du big-bang entre Joseph Silk, Jayant V. Narlikar, arbitrés par
Jean-Claude Pecker. Il regroupe également des articles de mise au point
sollicités par le rédacteur en chef de la rubrique Astronomie des
Comptes rendus de l'Académie des sciences. Les textes se proposent
de faire découvrir aux lecteurs, dans les principales disciplines
de l'astronomie, les résultats les plus remarquables des dernières
années. Ces mises au point sur des questions particulièrement
importantes de l'astronomie sont rédigées soit en francais, soit en
anglais et accompagnèes d'une bibliographie dètaillèe.
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Title: Petit compte rendu du congres de l'UAI en aout a Manchester.
Authors: Pecker, J. -C.
2000JAF....62...36P Altcode:
No abstract at ADS
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Title: A major debate: the Big Bang cosmology. VI. Conclusion.
Authors: Pecker, J. -C.
1999CRASB.327..861P Altcode:
No abstract at ADS
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Title: A major debate: the Big Bang cosmology. I. Introduction.
Authors: Pecker, J. -C.
1999CRASB.327..826P Altcode: 1999CR2...327..825P
No abstract at ADS
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Title: Jean Coulomb (1904 - 1998).
Authors: Pecker, J. -C.
1999LAstr.113..192P Altcode:
No abstract at ADS
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Title: SOLAR RESEARCH FROM SCHIZOPHRENIA TO UNITY - (Special
Historical Review)
Authors: Pecker, Jean-Claude
1999SoPh..184....1P Altcode:
No abstract at ADS
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Title: Roger Bonnet - The Early Years
Authors: Pecker, J. -C.
1998ESASP.431....7P Altcode: 1998sslt.conf....7P
No abstract at ADS
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Title: Elizabeth Nesme-Ribes, 11 September 1942 - 1996.
Authors: Pecker, J. -C.
1998LAstr.112...61P Altcode:
No abstract at ADS
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Title: Remembering Edith ALICE Mueller
Authors: Appenzeller, I.; Chmielewski, Y.; Pecker, J. -C.; de La Reza,
R.; Tammann, G.; Wayman, P.
1998ASSL..222.....A Altcode: 1998ream.conf.....A
No abstract at ADS
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Title: Jérôme de Lalande and international cooperation
Authors: Pecker, Jean-Claude
1998AcHA....3...52P Altcode:
At the age of twenty, Lalande, from Berlin, together with La Caille,
from the Cape of Good Hope, detemined the Moons parallax (1751-1752). It
was indeed an international operation which involved some planning in
Europe an countries and some local support in Prussia, in England, at
the Cape ... Later, Lalande was instrumental in organizing and analysing
the observations of the transit of Venus, in June 1761 and June 1769,
all over the World, in order to determine the parallax of the Sun. Still
later, he was a key figure in the organization, around F.-X. von Zach,
of the first International Astronomical meeting in Gotha (1798).
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Title: From Zürich to the IAU... Laughs and duties
Authors: Pecker, Jean-Claude
1998ASSL..222...28P Altcode: 1998ream.conf...28P
No abstract at ADS
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Title: Some Critiques of the Big Bang Cosmology
Authors: Pecker, Jean-Claude
1997JApA...18..323P Altcode:
Still more shocking than the metaphysical assumption of some initial
singularity, is the constant insistence upon the so-called cosmological
principle of "homogeneity" and "isotropy" of the Universe. Observations
do contradict this principle. And to me, the inhomogeneous,
fractal at least on a certain scale range, of the distribution of
matter is in itself an important cosmological fact, hitherto almost
neglected. Moreover difficultties as to the applicability of the second
principle of thermodynamics, observations of abnormal redshifts, etc.,
are casting large doubts not only upon the standard cosmological models,
but even on the interpretation of the observed redshift as due solely
to a universal expansion.
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Title: Questions and Comments that followed the Panel Discussion
Authors: Narlikar, J. V.; Padmanabhan, T.; Burbidge, Geoff; Arp, H. C.;
Cowsik, R.; Chokshi, Arati; Pecker, J. C.; Souradeep, Tarun; Pasupathy;
Godbole, Rohini; Gopal-Krishna; Cowsik, R.; Roscoe, D. F.; Mukunda, N.
1997JApA...18..477N Altcode:
No abstract at ADS
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Title: Renée Canavaggia, 9 May 1902 - 1996.
Authors: Pecker, J. -C.
1997JAF....55....1P Altcode:
No abstract at ADS
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Title: Éditorial
Authors: Pecker, J.
1997CRASB.324..589P Altcode:
No abstract at ADS
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Title: The Effects of Non-Sphericity in Diagnosis of Solar and
Stellar Atmospheres
Authors: Pecker, Jean-Claude
1996SoPh..169..277P Altcode:
Between the interplanetary medium, filled by winds, magnetic structures,
etc., and the interior of stars, opaque, and dominated heavily by
the gravitational spherical field, the stellar atmosphere is a place
where the true physical equilibrium, on the inside, sufficiently
described by the parameters L, M, R, and the chemical composition X,
Y, Z, is progressively changing into a situation far for equilibrium,
which needs many more parameters to be properly described.
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Title: The Changing Sun, Our Star (Invited Paper)
Authors: Pecker, J. -C.
1996RMxAC...4...39P Altcode:
No abstract at ADS
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Title: François Roddier received the Médaille Janssen 1995.
Authors: Pecker, J. -C.
1996LAstr.110..201P Altcode:
No abstract at ADS
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Title: Book reviews
Authors: Humphreys, R. M.; Kemp, S.; Savonije, G.; van der Hucht,
K. A.; van der Kruit, P. C.; Miley, G.; Bumba, V.; van Nieuwkoop,
J.; van Hoolst, T.; Cox, A.; Rutten, R. J.; Kleczek, J.; de Jager,
Cornelis; Jerzykiewicz, M.; Zwaan, C.; Poedts, S.; Sakai, Jun-Ichi;
Pecker, J. -C.; Heikkila, W.; de Jong, T.; Wilson, P. R.; Müller,
E. A.; Hoyng, P.; Icke, V.; Shore, S. N.; Achterberg, A.; Lucchin, F.;
Butcher, H.; Ne'Eman, Y.; Heidmann, J.; Belton, M. J. S.; de Graauw,
Th.; Waters, L. B. F. M.; Pacini, F.; Hultqvist, B.; Akasofu, S. -I.;
Vial, J. -C.; Schatzman, E.; van der Laan, H.; Cole, K. D.; Vanbeveren,
D.; Southwood, D.; van der Klis, M.; Katgert, Peter
1996SSRv...76..339H Altcode:
No abstract at ADS
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Title: Hervé Fabre, 27 November 1905 - 1995.
Authors: Pecker, J. -C.
1996JAF....50....4P Altcode:
No abstract at ADS
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Title: En souvenir de Philippe Delache (8 octobre 1937 - 1994)
Authors: Pecker, J. -C.
1995JAF....48....4P Altcode:
No abstract at ADS
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Title: Hommage à François Arago.
Authors: Pecker, J. -C.
1994LAstr.108..336P Altcode:
No abstract at ADS
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Title: The sun: A synoptic view
Authors: Pecker, J. -C.
1994VA.....38..111P Altcode:
Certain ideas emerge from modern developments in solar studies: (a)
the distinction between the quiet and active Sun is misleading and
obsolete; (b) the theoretical treatment of the Sun as an isotropic
sphere, without magnetism, is obviously not valid; (c) multilayer
active phenomena are more important as proxies for deeper phenomena
than per se; (d) the solar magnetic cycle cannot be described only
by the level of activity, but with the consideration of migrations
of activity. Moreover, the bipolar phase of its evolution and its
toroidal phase have different consequences. These points emerge with
a systematic look at each of the four parts of this paper, dealing
with: (1) The Sun as a variable star (irradiance, radius, neutrino
flux). (2) The coupling between rotation, magnetism, convection. (3)
The active phenomena in the solar outer layers. (4) The solar cycle and
migrations. The conclusion is naturally oriented towards the development
of more observations, both on the ground, coordinated over the Earth,
and in space, using several types of satellites.
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Title: The Sun today.
Authors: Pecker, J. -C.
1994LNP...432....3P Altcode: 1994LNPM...11....3P
A few ideas emerge from modern developments: (a) the distinction
between the quiet and active Sun is misleading and obsolete; (b)
the theoretical treatment of the Sun as an isotropic sphere, without
magnetism, is obviously not valid; (c) multilayer active phenomena
are important as proxies for deeper phenomena more than per se;
(d) the solar cycle cannot be described simply by the level of
activity, but it needs a consideration of the latitudinal migrations of
activity. These points emerge following a systematic look at each of the
four parts of this paper: 1) The Sun as a variable star (irradiance,
radius, neutrino flux). 2) The coupling between rotation, magnetism,
convection. 3) The active phenomena in outer layers. 4) The solar
cycle and migrations. The conclusion is naturally oriented towards
the development of more complete observations, both on the ground,
coordinated over the Earth, and in space, using multiple satellites.
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Title: Concerning various types of solar forcing and their effects
Authors: Pecker, J. C.
1994seit.conf..403P Altcode:
No abstract at ADS
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Title: Jan Hendrik Oort, 28 avril 1900 - 05 novembre 1992.
Authors: Pecker, J. -C.
1993LAstr.107...60P Altcode:
No abstract at ADS
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Title: La vie et l'œvre de Jan Hendrik Oort (1900 - 1992).
Authors: Pecker, J. -C.
1993CRASG..10..535P Altcode:
No abstract at ADS
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Title: Cataclysmic variables and related objects
Authors: Hack, Margherita; Ladous, Constanze; Jordan, Stuart D.;
Thomas, Richard N.; Goldberg, Leo; Pecker, Jean-Claude
1993NASSP.507.....H Altcode: 1993cvro.nasa.....H; 1993QB835.H27......
No abstract at ADS
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Title: Structure and Physics of Solar Faculae - Part Five
Authors: Pecker, J. -C.; Dumont, S.; Mouradian, Z.
1992SoPh..138..213P Altcode:
Taking into account the effect of roughness (or local departures
from sphericity) of the emitting layers in the chromosphere-corona
transition zone (CCT) allows one to determine the optical depths
of layers responsible for resolved structures in CII, CIII, OIV,
and OVI lines. The result, at the `top' of the irregularities, is
of the order of respectively τ<SUB>1</SUB> ≥ 3.5,2.0, 1.6,0.5,
and for the `bottom' of these irregularities, τ<SUB>2</SUB> = 0.7,
0.4, 0.3, 0.25. The characteristic angle of these irregularities is,
respectively, of the order of 35 °, 33 °, 35 °, and 41 °. For
unresolved structures of CIV and OVI (already analyzed in the spherical
symmetry hypothesis in Paper III), one finds τ<SUB>1</SUB> ≈ 0.6;
0.9 and τ<SUB>2</SUB> ≈ 0.12; 0.2 in the case of quiet areas; in the
case of active areas, the range is broader for CIV and OVI, from 1.0
to 1.7 for τ<SUB>1</SUB> and from 0.2 to 0.9 for τ<SUB>2</SUB>. The
values obtained from OVI are in reasonable agreement with each other
for resolved and unresolved structures. And the obtained values of
τ<SUB>1</SUB> and τ<SUB>2</SUB> correspond not too badly with the
determinations made in Paper III, by methods not exceedingly influenced
by the spherical symmetry hypothesis.
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Title: Le promeneur du ciel
Authors: Pecker, Jean Claude
1992fos..book.....P Altcode:
No abstract at ADS
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Title: The future of the sun
Authors: Pecker, Jean Claude
1992fots.book.....P Altcode:
No abstract at ADS
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Title: Book reviews
Authors: Linssen, P. F. J.; Valníček, B.; Pecker, Jean-Claude;
Marov, M. Ya; Abalakin, V. K.; Achterberg, A.; Kuperus, M.; Sterzik, M.
1991SSRv...56..419L Altcode:
No abstract at ADS
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Title: Book Review: Essays on the trial of Galileo / Specola Vaticana
and University of Notre Dame Press, 1989
Authors: Pecker, J. C.
1991SSRv...56..420P Altcode:
No abstract at ADS
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Title: Does a possible laboratory observation of a frequency
anisotropy of light result from a non-zero photon mass m?
Authors: Narlikar, J. V.; Pecker, J. C.; Vigier, J. P.
1991PhLA..154..203N Altcode:
Assuming a priori the existence of a non-zero photon rest-mass
m<SUB>γ</SUB>>0 and justifying this assumption, we can predict
the existence of an anisotropy in velocity and frequency of light
in the direction of the apex of the 3 K background cosmic radiation
field. Since this frequency shift can now be tested in the laboratory,
it is important to improve the precision of these measurements in
order to check our predictions. Its possible confirmation implies
indeed the definition of an absolute evolution parameter in the rest
frame Σ<SUB>0</SUB> of this 3 K background microwave radiation.
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Title: Some consequences of a spatially varying cosmological constant
in a spherically symmetric distribution of matter.
Authors: Narlikar, J. V.; Pecker, J. -C.; Vigier, J. -P.
1991JApA...12....7N Altcode:
This paper investigates the effects of the spatial variation of the
cosmological constant Λ on the spacetime geometry within and outside
a massive object. It is seen that the variation of Λ with the radial
coordinate introduces non-trivial changes leading to spacetime closing
on itself around a massive object. It may also be possible to generate
interior solutions that lead to flat rotation curves of galaxies.
---------------------------------------------------------
Title: The search for valid theories of the universe
Authors: Pecker, J. -C.
1991MmSAI..62..499P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The global Sun.
Authors: Pecker, Jean-Claude
1991sia..book....1P Altcode:
After a definition of the various terms used to identify the solar
layers, from the center to the exterior, and a physical description of
these layers, the author shows that various couplings are controlling
the physics in the core and the outer layers, and even the planets. One
of these couplings is between convection, rotation and magnetism (the
dynamo), and another coupling is between solar activity and planetary
physics. These couplings allow to use observed data (oscillations,
neutrinos, emergence of active regions, and of course their evolution)
to infer properties of the solar interior. The theoretical knowledge
of the Sun must take into account the existence of these couplings,
as well as the existence of another type of coupling, the one that
links the past and the present states of our Sun.
---------------------------------------------------------
Title: The effect of roughening on the determination of the chemical
composition of sun and stars
Authors: Pecker, Jean-Claude; Zimba, Jason R.
1990CRASB.311...83P Altcode: 1990CRASM.311...83P
When solar and stellar line equivalent widths are used to determine
chemical composition, the assumption of a plane-parallel or, in any
case, of a spherical atmospheric structure is usually made. But in the
solar atmosphere, and presumably in the atmospheres of many other stars,
there are granulation effects which acts to cause a 'roughening'in the
iso-tau layers. Such an optical roughening could have an effect upon
equivalent widths; if this effect were found to be large, present
abundance estimates would be called into question. A calculation
which makes use of a phenomenological model of the roughening shows,
however, that the effects are small. They very well could be larger
in the case of supergiants; but then another model should be used to
treat the problem properly.
---------------------------------------------------------
Title: Closing Remarks: Astronomical
Authors: Pecker, J. -C.
1990RSPTA.330..683P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: On the Effect of `Roughening' upon Chemical Abundance
Determinations in the Sun and Stars
Authors: Pecker, J. -C.; Zimba, J. R.
1990BAAS...22..810P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Public Misconceptions about Astronomy
Authors: Acker, A.; Pecker, J. -C.
1990teas.conf..229A Altcode: 1990IAUCo.105..229A
No abstract at ADS
---------------------------------------------------------
Title: André Danjon et l'Astrophysique Théorique.
Authors: Pecker, J. -C.
1990srst.conf...15P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Introduction
Authors: Pecker, Jean-Claude
1990ASSL..159....1P Altcode: 1990insu.conf....1P; 1990IAUCo.121....1P
No abstract at ADS
---------------------------------------------------------
Title: The Earth's climate and variability of the Sun over recent
millennia: Introductory remarks.
Authors: Pecker, J. -C.; Runcorn, S. K.
1990ecvs.conf..399P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Earth's climate and variability of the Sun over
recent millennia: geophysical, astronomical and archaeological
aspects. Proceedings.
Authors: Pecker, J. -C.; Runcorn, S. K.
1990ecvs.conf.....P Altcode:
First published in Philosophical Transactions of the Royal Society of
London, Series A, Vol. 330, No. 1615, p. 395 - 687 (24 Apr 1990).
---------------------------------------------------------
Title: Book-Review - 10TH European Regional Astronomical Meeting -
Prague - 1987AUG
Authors: Perek, L.; Hejna, L.; Sobotka, M.; Ceplecha, Z.; Pecina,
P.; Sidlichovsky, M.; Palous, J.; Harmanec, P.; Pecker, J. C.
1989BAICz..40..196P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Book-Review - Cosmic Understanding Philosophy and Science of
the Universe
Authors: Munitz, M. K.; Pecker, J. C.
1989SSRv...50..388M Altcode: 1989IAUCo.107..388M
No abstract at ADS
---------------------------------------------------------
Title: Book reviews
Authors: Marov, M. Ya; Garmany, C. D.; Heck, André; Schadee, A.;
McNally, D.; van der Kruit, P. C.; Pecker, J. -C.; de Jager, Cornelis;
Somov, B. V.
1989SSRv...50..385M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Brefs propos sur la culture scientifique.
Authors: Pecker, J. -C.
1989JAF....35....2P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Cosmology
Authors: Pecker, Jean-Claude
1989gadv.book..273P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The impact of astronomy on the development of western science
Authors: Pecker, Jean-Claude
1989cp...book...51P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: FGK stars and T Tauri stars
Authors: Cram, Lawrence E.; Kuhi, Leonard V.; Jordan, Stuart; Thomas,
Richard; Goldberg, Leo; Pecker, Jean-Claude
1989NASSP.502.....C Altcode: 1989QB843.C6C73....; 1989fstt.book.....C
The purpose of this book, FGK Stars and T Tauri Stars, like all other
volumes of this series, is to exhibit and describe the best space
data and ground based data currently available, and also to describe
and critically evaluate the status of current theoretical models
and physical mechanisms that have been proposed to interpret these
data. The method for obtaining this book was to collect manuscripts
from competent volunteer authors, and then to collate and edit these
contributions to form a well structured book, which will be distributed
to an international community of research astronomers by NASA and by
the French CNRS.
---------------------------------------------------------
Title: The Sun, an ideal laboratory for the modelist?
Authors: Pecker, Jean-Claude
1989mse..proc..165P Altcode:
Evolutionary trends in constructing laboratory models of the sun have
historically followed two different paths. One was to study the sun by
itself without reference to other similar objects. The second method
was the technique of solar analogs. These modeling trends, from the
17th century to the present, are reviewed.
---------------------------------------------------------
Title: Victor Ambartsumian and the IAU
Authors: Pecker, Jean-Claude
1988Ap.....29..409P Altcode: 1989Ap.....29..409P
No abstract at ADS
---------------------------------------------------------
Title: The center-to-limb variation on solar chromospheric and
transition lines, and the effect of roughness of emitting layers
Authors: Pecker, J. -C.; Dumont, S.; Mouradian, Z.
1988A&A...196..269P Altcode:
The effect of roughness of the emitting layers is computed in the case
where the optical depth is small, both in cases of resolved structures
and of unresolved structures. The geometry of the emitting layers
is schematized by parameters, mostly the "angle" representative of
the "grooves" or of the "spikes", and the ratio between the optical
depth of the "valleys" and of the "hills". The effect of these various
parameters on the center-to-limb behaviour of computed spectral lines is
discussed. The method for determining these parameters from the observed
data is outlined; examples will be given in forthcoming publications.
---------------------------------------------------------
Title: New vistas on the solar activity cycle
Authors: Pecker, Jean-Claude
1988IrAJ...18..133P Altcode:
After a short introduction about the main new progress in solar physics
and the change of point of view it is leading to, special attention
is devoted to the empirical knowledge recently acquired concerning
the development of solar activity during "cycles" (or "migrations"),
and the inference with respect to the solar machine in which rotation,
magnetism, and convection are coupled in a complex way.
---------------------------------------------------------
Title: How to describe physical reality?
Authors: Pecker, J. -C.
1988Apei....2....1P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: A possible tired-light mechanism.
Authors: Pecker, J. -C.; Vigier, J. -P.
1988Apei....2...13P Altcode:
Recent developments in physics and astrophysics lead one to introduce
a new tired-light mechanism involving an interaction between a massive
photon and Dirac's vacuum particles.
---------------------------------------------------------
Title: L'astronomie AU College de France
Authors: Pecker, J. C.
1988IAUS..133....5P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: O stars and Wolf-Rayet stars
Authors: Conti, Peter S.; Underhill, Anne B.; Jordan, Stuart; Thomas,
Richard N.; Goldberg, Leo; Pecker, Jean-Claude; Baade, D.; Divan,
L.; Garmany, C. D.; Henrichs, H. F.; Kudritzki, R. P.; Pauldrach,
A.; Prévot-Burnichon, M. -L.; Puls, J.
1988NASSP.497.....C Altcode: 1988oswr.book.....C
Basic information is given about O and Wolf-Rayet stars indicating
how these stars are defined and what their chief observable properties
are. Part 2 of the volume discussed four related themes pertaining to
the hottest and most luminous stars. Presented are: an observational
overview of the spectroscopic classification and extrinsic properties
of O and Wolf-Rayet stars; the intrinsic parameters of luminosity,
effective temperature, mass, and composition of the stars, and a
discussion of their viability; stellar wind properties; and the
related issues concerning the efforts of stellar radiation and
wind on the immediate interstellar environment are presented. <P
/>Contents: Perspective (R. N. Thomas).Part I. Introduction (L. Divan,
M.-L. Prévot-Burnichon).1. Introducing the O and Wolf-Rayet stars.Part
II. One perspective on O, Of, and Wolf-Rayet stars emphasizing winds
and mass loss, with remarks on environment and evolution:2. Overview of
O, Of, and Wolf-Rayet populations (P. S. Conti). 3. Intrinsic stellar
parameters (P. S. Conti, D. Baade). 4. Stellar winds: (a) Introduction
(P. S. Conti). (b) Mass loss from O stars (C. D. Garmany). (c) Mass
loss in Wolf-Rayetstars (P. S. Conti). (d) Radiation-driven winds
of hot luminous stars (R. P. Kudritzki, A. Pauldrach, J. Puls). (e)
Intrinsic variability in ultraviolet spectra of early-type stars: the
discrete absorption lines (H. Henrichs). 5. Environments and evolution
(P. S. Conti).Part III. Another perspective on O, Of, and Wolf-Rayet
stars, emphasizing model atmospheres and possibilities for atmospheric
heating (A. B. Underhill): 6. Understanding the O and Wolf-Rayet
stars. 7. Model Atmospheres and the theory of spectra for O and
Wolf-Rayet stars. 8. The physics of the mantles of hot stars. 9. Summary
of processes influencing the spectra of O and Wolf-Rayet stars.
---------------------------------------------------------
Title: Pour comprendre l'univers
Authors: Delsemme, A. H.; Pecker, J. -C.; Reeves, H.
1988pclu.book.....D Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Victor Ambartsumian and the I.A.U.
Authors: Pecker, J. C.
1988Afz....29....9P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Difficulties of standard cosmologies.
Authors: Pecker, J. -C.
1988nda..conf..295P Altcode:
The standard cosmologies do account well for some classical
observations; but it is clear that other cosmologies satisfy them
as well, or better, at the expense of some ad-hoc constructions. On
the other side, ad-hoc constructions must indeed be also introduced
to improve the standard cosmologies, in such a way that they satisfy
some tests, for which non-standard cosmologies are better suited to
the representation of observations.
---------------------------------------------------------
Title: Internal dynamics of the Gum nebula.
Authors: Srinivasan, M.; Pecker, J. C.; Pottasch, S. R.; Sahu, K. C.
1987Msngr..50...11S Altcode: 1987Mgr....50...11S
The state of knowledge of the Gum Nebula is reviewed, and the results of
new observations are reported. Findings made by previous observations
are summarized. A new study is reported which found the expansion
velocity of the nebula and failed to detect forbidden O III emission
in any of the 14 positions observed. None of the H-alpha profiles
showed splitting.
---------------------------------------------------------
Title: A Possible Tired-Light Mechanism /
Authors: Pecker, J. -C.; Vigier, J. -P.
1987IAUS..124..507P Altcode:
Recent developments in physics and astrophysics lead the authors
to reintroduce a new tired-light mechanism, implying an interaction
between a massive photon and the particles of Dirac's vacuum.
---------------------------------------------------------
Title: L'Observatoire de Juvisy.
Authors: Pecker, J. -C.; Pernet, J.
1987LAstr.101..331P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: General Introduction - Protostars and Molecular Clouds
Authors: Pecker, J. C.
1987penm.conf....1P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: From Tycho Brahe to Prague 1987: the ever changing universe.
Authors: Pecker, J. -C.
1987PAICz..70....3P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Protostars and molecular clouds. Séminaires organisés dans
le cadre de la Chaire d'Astrophysique Théorique duCollège de France,
Paris, en février et en mars 1986.
Authors: Montmerle, T.; Bertout, C.; Pecker, J. -C.
1987pmcs.book.....M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Book-Review - James E. Keeler Pioneer American Astrophysicist
and the Early Development of American Astrophysics
Authors: Osterbrock, D. E.; Pecker, J. C.
1986SSRv...43..386O Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Book reviews
Authors: Kleczek, J.; van Gent, R. H.; Rutten, Robert J.; de Munck,
J. C.; Slottje, C.; Severne, G.; Pecker, Jean-Claude; Postma, H.;
Grishchuk, L. P.; Niewenhuijzen, H.; Schuiling, R. D.; van Beek, H. F.;
Reijnen, G. C. M.; Heidmann, Jean; Lemaire, J.; Bleeker, Johan; Icke,
V.; Neéman, Y.; Feast, M. W.; de Graaff, W.
1986SSRv...43..383K Altcode:
No abstract at ADS
---------------------------------------------------------
Title: A la recherche du coronium.
Authors: Laloë, S.; Pecker, J. -C.
1986LAstr.100..175L Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Capire l'astronomia.
Authors: Pecker, J. -C.
1986capi.book.....P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: A la recherche du coronium. Seconde partie.
Authors: Laloë, S.; Pecker, J. -C.
1986LAstr.100..227L Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The M-type stars
Authors: Johnson, Hollis Ralph; Querci, Francois R.; Jordan, Stuart;
Thomas, Richard; Goldberg, Leo; Pecker, Jean-Claude
1986NASSP.492.....J Altcode: 1986mts..book.....J; 1986QB843.M16M89...
No abstract at ADS
---------------------------------------------------------
Title: Astronomie Flammarion
Authors: Pecker, Jean Claude
1985asfl.book.....P Altcode: 1985QB44.2.A849....
No abstract at ADS
---------------------------------------------------------
Title: Le pompage optique naturel dans le milieu astrophysique
Authors: Pecker, J. -C.
1985AnPh...10..631P Altcode:
The title of this lecture abstracts only a part of it : the importance
in astrophysics of the study of non-LTE situations has become
considerable, as well in the stellar atmospheres as, still more, in
the study of fortuitous coincidences as a mechanism of formation of
emission line nebular spectra, or of molecular interstellar « masers
». Another part of this talk underlines the role of Kastler in his
time, and describes his warm personality through his public reactions
in front of the nuclear armement, of the Viet-Nam and Algerian wars,
of the problems of political refugees... Kastler was a great scientist
; he was also a courageous humanist. 1976 : Les accords nucléaires
du Brésil : allocution d'ouverture (19 mars). Colloque sur le sujet
ci-dessus. 1976 : La promotion de la culture dans le nouvel ordre
économique international, allocution à l'occasion d'une table ronde
sur ce thème par l'UNESCO (23-27 juin 1976) ; « Sciences et Techniques
», octobre 1976. 1979 : La bête immonde (avec J.-C. Pecker), « Le
Matin », 20 mars. 1979 : Appel à nos ministres (avec J.-C. Pecker), «
Le Monde », 13 décembre. 1979 : Le flou, le ténébreux, l'irrationnel
(avec J.-C. Pecker), « Le Monde », 14 septembre. 1980 : Education
à la paix, Préface, in : Publ. UNESCO. 1981 : Le vrai danger,
« Le Monde », 6 août 1981. 1982 : Nucléaire civil et militaire,
« Le Monde », 1er juin 1982. 1982 : Les scientifiques face à la
perspective d'holocauste nucléaire (texte inédit). <P />
---------------------------------------------------------
Title: Vistas on stellar-solar atmospheres
Authors: Pecker, J. -C.
1985AuJPh..38..799P Altcode:
An account is given to the development of stellar atmosphere modeling
in the direction of greater consistency; the progressive relaxation
of stringent hypotheses, such as those of radiation equilibrium, LTE,
hydrostatic equilibrium, and plane-parallel geometry, characterizes this
evolution. Attention is given to the origin and nature of the concept
of 'roughness', or departures from spherical geometry, as well as its
recent application in light of Skylab and OSO-8 UV data. An overall
coupling between mechanisms which characterize the stellar-solar
machinery described is suggested.
---------------------------------------------------------
Title: The redshift distribution law of quasars revisited
Authors: Depaquit, S.; Pecker, J. -C.; Vigier, J. -P.
1985AN....306....7D Altcode:
Can observational selection effects, tied with the existence of
strong lines, explain the observed log(1+z) periodicity of the
quasar's histogram, as sometimes claimed? A first approach shows that
one must distinguish radio from optical quasars. In the former case
spectroscopic selection due to strong lines is investigated from the
study of homogeneous samples. Then, the role played by pairs of strong
lines in the redshift's determination is evaluated and it shows that
the spectroscopic selection cannot explain the observed periodicity
of the radio quasar's histogram. The study of the complete sample
confirms this conclusion.
---------------------------------------------------------
Title: Astronomie Flammarion, Vols. 1+2.
Authors: Rösch, J.; Wlérick, G.; Guibert, J.; Bonnet, R.; Vedrenne,
G.; Celnikier, L.; Morando, B.; Boischot, A.; Brahic, A.; Kandel,
R.; Dumont, S.; Praderie, F.; Magnan, C.; Gerbaldi, M.; Zahn, J. -P.;
Gouguenheim, L.; Bottinelli, L.; Heidmann, N.; Heidmann, J.; Véron,
P.; Nottale, L.; Pecker, J. -C.; Golay, M.
1985afv..book.....R Altcode:
Contents: L'astronomie à l'œil nu (J. Rösch). L'astronomie
optique; de Galilée à la fin du XX<SUP>e</SUP> siècle
(G. Wlérick). Télescopes et lunettes du XX<SUP>e</SUP> siècle
(G. Wlérick). La radioastronomie (J. Guibert). L'astronomie
spatiale (R. Bonnet). L'astronomie des hautes énergies
(G. Vedrenne). L'exploration in situ dumilieu astronomique
(L. Celnikier). Le système solaire: généralités (B. Morando). Les
planètes telluriques (L. Celnikier). Astéroïdes, comètes et
météorites (L. Celnikier). Jupiter (A. Boischot). Le monde de Saturne
(A. Brahic). Les confins du système solaire (Uranus, Neptune et Pluton)
(A. Brahic). Le Soleil, les planètes, la Terre (R. Kandel). Le Soleil,
étoile typique (S. Dumont). Les spectres stellaires: la connaissance
des étoiles (F. Praderie). L'interaction des étoiles et du milieu
environnant (C. Magnan). La Galaxie: étoiles et matière interstellaire
(M. Gerbaldi). L'évolution des étoiles (J.-P. Zahn). Les facteurs de
l'évolution galactique (L. Gouguenheim). Forme et classification des
galaxies (L. Bottinelli, N. Heidmann). Amas et superamas de galaxies
(J. Heidmann). Les quasars (P. Véron). Évolution des galaxies
(L. Gouguenheim). Les faits cosmologiques (L. Bottinelli). La cosmologie
de la grandeexplosion (L. Nottale). Le débat cosmologique (L. Nottale).
---------------------------------------------------------
Title: The Redshift Distribution Law of Quasars Revisited
Authors: Depaquit, S.; Pecker, J. C.; Vigier, J. -P.
1985AN....306Q...7D Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Eine Neudiskussion des Verteilungsgesetzes der
Quasar-Rotverschiebungen
Authors: Depaquit, S.; Pecker, J. -C.; Vigier, J. -P.
1985AN....306R...7D Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Les oscillations du Soleil et des étoiles.
Authors: Pecker, J. -C.
1984CRASG...1..199P Altcode:
Des travaux récents ont attiré l'attention du monde astronomique,
en mettant en évidence des oscillations dans l'atmosphère du Soleil
et des étoiles. Que des étoiles oscillent, cela n'est pas nouveau:
on connaît depuis des décennies le caractère oscillant, pulsatoire,
des étoiles du type δ Cephei, ou Céphéides. Mais les oscillations
découvertes dans le Soleil et dans α Centauri A sont loin d'être
aussi simples: elles ne sont pas {radiales}. Divers harmoniques se
superposent les uns aux autres et prennent plus d'importance que
l'oscillation fondamentale; pour chacun d'eux, la surface stellaire
est un réseau de lignes nodales, non affectées par le mouvement
oscillatoire. Certaines de ces oscillations sont commandées par
la force de rappel qu'exerce la compression locale des gaz (modes
acoustiques); d'autres par celle qu'exercent les forces de gravité
(modes de gravité). La distribution d'énergie entre les différents
modes et les différents harmoniques est en effet un reflet fidèle de
la structure interne de l'étoile. Il est ainsi possible de sonder des
milieux jusqu'à présent tout-à-fait inaccessibles à l'observation.
---------------------------------------------------------
Title: Structure and Physics of Solar Faculae - Part Four -
Chromospheric Granular Structure
Authors: Fang, C.; Mouradian, Z.; Banos, G.; Dumont, S.; Pecker, J. C.
1984SoPh...91...61F Altcode:
The methods used and the results obtained in the measurement of
the distances between the centers of chromospheric granules are
described. A coincidence of these structures at two different altitudes
was observed. Observations made in the K2v, or in the K3 and CN lines
permit the comparison of two different altitudes: the upper and the
lower chromosphere. These results include flocculi on the edge of
the supergranules as well as plages. Two main results are obtained:
(l)the most likely distance between two neighboring granules is, at
the minimum of the solar cycle, of about 2″. 60 for K3 and 2″.45
for CN, and (2) this distance is decreasing with growing solar activity.
---------------------------------------------------------
Title: Photospheric and Chromospheric Magnetic Field Structure
Authors: Mouradian, Z.; Dumont, S.; Fang, C.; Pecker, J. C.; Banos, G.
1984apoa.conf...63M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Sous l'etoile soleil
Authors: Pecker, Jean Claude
1984sls..book.....P Altcode: 1984QB521.P4.......
No abstract at ADS
---------------------------------------------------------
Title: Active Regions of G-Type Stars
Authors: Hiei, H.; Mouradian, Z.; Dumont, S.; Pecker, J. C.
1984apoa.conf..272H Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Active Phenomena in the Outer Atmosphere of the Sun and Stars
Authors: Pecker, J. -C.; Uchida, Yutaka
1984apoa.conf.....P Altcode: 1984apoa.book.....P
No abstract at ADS
---------------------------------------------------------
Title: Structure and Physics of Solar Faculae - Part Three - the
Densities in the Chromosphere-Corona Transition Zone
Authors: Dumont, S.; Mouradian, Z.; Pecker, J. -C.; Vial, J. -C.;
Chipman, E.
1983SoPh...83...27D Altcode:
Si IV, C IV, and O VI resonance lines have been measured above quiet
and active solar regions from both pointed OSO-8 instruments. From
calibrated profiles, optical depths are computed with three different
methods. All three methods provide evidence that the opacity above
faculae is lower than above the quiet Sun.
---------------------------------------------------------
Title: Lectures on the planets: General introduction - The formation
of the planetary environment of stars
Authors: Pecker, J. -C.
1983CRASB.296D...1P Altcode: 1983CRASA.296.....P
Current theoretical models of star formation are reviewed, especially as
they affect the evolution of the planets. The difficulties inherent
in constructing cosmological models from observational data are
indicated. The initial differentiation of the interstellar clump which
will become a star is shown to be complex and as yet rather obscure,
whereas computer models of the condensation process which follows
are being developed and refined with some success. In typical models,
the gradual condensation of the original homogeneous gas sphere leads
via free-fall and heating phases to the ignition of a thermonuclear
reaction in the star, while the progressive flattening of the
remaining circumstellar cloud facilitates the accretion of planetary
bodies. Color/magnitude diagrams of very young clusters are presented
as evidence that large numbers of stars have flattened protoplanetary
disks. Although this evidence supports the gradual-accretion model of
planet formation in the solar system, more 'catastrophic' mechanisms
such as solar eruptions or the approach of a massive second star cannot
be ruled out.
---------------------------------------------------------
Title: L'atmosphère du soleil et des étoiles.
Authors: Pecker, J. -C.
1983utu..conf....1P Altcode:
Contents: Introduction. Le soleil, des rayons X aux ondes
kilométriques. L'étude des étoiles dans les domaines X et UV. Un
phénomène chromosphérique: l'effet Wilson-Bappu. L'activité
solaire. La sismologie solaire. La neutrino-astronomie. Conclusions.
---------------------------------------------------------
Title: The star "sun". I.
Authors: Pecker, J. C.
1983Vasio..31....1P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The star "sun". II.
Authors: Pecker, J. -C.
1983Vasio..31...25P Altcode:
The sun is considered as it would appear to an astronomer living near
Sirius. Various problems related to the mass, luminosity and solar
spectrum are discussed.
---------------------------------------------------------
Title: Structure and Physics of Solar Faculae - Part One - Principles
and Observational Procedures from Ground-Based Instruments and
OSO-8 Satellite
Authors: Dumont, S.; Mouradian, Z.; Pecker, J. -C.
1982SoPh...78...71D Altcode:
This paper reviews the motivations and the principles of the
measurements which aim at a systematic exploration, from photosphere to
corona, of the facular regions (plages). The sequence of observation
actually achieved is described. Preliminary results are given, in a
purely indicative way. Detailed analyses will be made in further papers.
---------------------------------------------------------
Title: Structure and Physics of Solar Faculae - Part Two - the
Non-Thermal Velocity Field above Faculae
Authors: Mouradian, Z.; Dumont, S.; Pecker, J. -C.; Chipman, E.;
Artzner, G. E.; Vial, J. C.
1982SoPh...78...83M Altcode:
The OSO-8 satellite enabled us to study various characteristics of
the profiles of Si II, Si IV, C IV, and O VI lines above active areas
of the Sun, as well as above quiet areas, and to derive some physical
properties of the transition region between chromosphere and corona
(CCT): (i) The study of the lines shows a general tendency for the
microvelocity fields on the average to be nearly constant for the
heights corresponding to T > 10<SUP>5</SUP> K; however they seem
to slightly increase with height in quiet areas, and decrease in
active areas. (ii) A multicomponent model of the CCT is however quite
necessary, and its geometry is far from being a set of plane-parallel
columns. It is similar to an association of moving knots within the
non-moving principal component of the matter. (iii) The proportion
of mass, in the knots relative to that in the non-moving component,
is several times larger in active regions than in quiet regions. (iv)
In the knots, the non-thermal microvelocity fields are smaller in active
regions and seem to decrease for T increasing above 10<SUP>5</SUP> K,
contrary to what happens in the steady principal component. Of course,
we consider that microturbulence and Doppler shift are two aspects of
the same distribution of velocity.
---------------------------------------------------------
Title: Clefs pour l'astronomie.
Authors: Pecker, J. -C.
1982cpl..book.....P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Meteorological Characteristics of the Solar Climate and
Activity - Some Remarks
Authors: Pecker, J. C.
1982coas.conf..151P Altcode: 1982cia..conf..151P
No abstract at ADS
---------------------------------------------------------
Title: The Star "Sun" (Invited Review Paper)
Authors: Pecker, J. C.
1982ASSL...96...25P Altcode: 1982spls.meet...25P
Classical astronomical parameters are employed to characterize the
sun from a viewpoint originating from the star Sirius. Attention
is given to the solar brightness distribution, the solar radius,
oblateness and oscillations, and small amount of evidence for a secular
variation. The mass of the sun is considered, as well as the luminosity,
the line spectrum defining it as a G 2 V star, and the sun as a center
of a planetary system. Finally, particular facets of stellar studies
which are possible due to the closeness of the sun and the planets are
reviewed, including perturbative effects due to the presence of the
giant planets, the details of stellar activity which can be observed,
and relativistic effects around the sun.
---------------------------------------------------------
Title: Cent ans d'astronomie à travers "L'Astronomie".
Authors: Pecker, J. -C.
1982LAstr..96..123P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Citation in Astronomy
Authors: Pecker, Jean-Claude
1981Sci...214..254P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Les etoiles et les curiosites du ciel : description complete
du ciel visible a l'oeil nu et de tous les objets celestes faciles
a observer : supplement de l'Astronomie populaire
Authors: Flammarion, Camille; Pecker, Jean Claude
1981eccd.book.....F Altcode: 1981QB44.F59.......
No abstract at ADS
---------------------------------------------------------
Title: Les étoiles et les curiosités du
ciel. C._Flammarion. C._Marpon, C._Flammarion, éditeurs en 1882.
Authors: Pecker, J. -C.
1981ecc..book.....P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Champs de vitesses et champs magnétiques à petite échelle
dans l'atmosphère solaire.
Authors: Pecker, J. -C.
1981CRASB.293D..15P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Microturbulence near the edge of a solar plage
Authors: Simon, G.; Mouradian, Z.; Dumont, S.; Pecker, J. C.; Artzner,
G.; Vial, J. C.
1980A&A....89L...8S Altcode:
Observations of the Ca II K line at the edge of a solar plage show
enhanced separation of the K2 peaks with respect to the measured value
inside the plage and in the quiet sun. This effect may be interpreted as
a variation of microturbulent motions at the height of formation of K2.
---------------------------------------------------------
Title: Center-to-limb solar observations of the K<SUB>2</SUB>
component of the Ca II K line with the OSO 8 satellite.
Authors: Dumont, S.; Mouradian, Z.; Pecker, J. -C.; Simon, G.; Artzner,
G. E.; Vial, J. C.
1980CRASB.290..365D Altcode:
OSO 8 spectrometer measurements of the separation between emission
peaks in the K2 Ca II line across the solar disk in quiet and active
regions are presented. The center-to-limb variation in emission peak
separation is found to differ slightly for quiet and facula regions
at distances greater than 0.2 solar radii from the limb, in agreement
with previous observations. For a facula located at the solar limb,
however, the peak separation is observed to be up to 35 percent greater
than in quiet regions, indicating the presence of a region of enhanced
chromospheric turbulence surrounding the faculae.
---------------------------------------------------------
Title: Non thermal velocities in the chromosphere-corona transition
zone of solar active regions.
Authors: Dumont, S.; Mouradian, Z.; Pecker, J. -C.; Chipman, E.;
Artzner, G.; Vial, J. -C.
1980CRASB.290..317D Altcode:
OSO 8 satellite observations of lines of the Si II, Si IV, C IV and
O VI ions in the ultraviolet spectrum of active solar regions are
considered. It is noted that for the case of pronounced physical
dispersion of the data, there is no marked systematic variation from
the center to the edge of the solar disk. The nonthermal velocities
in the transition zone are, for a given temperature, the same as for
quiet regions. In addition, the velocities tend to reach a constant
value at temperatures above 100,000 deg K, and the observed physical
dispersion is much higher than the inaccuracy of the data.
---------------------------------------------------------
Title: Obituary - Chalonge, Daniel
Authors: Pecker, J. C.
1980QJRAS..21..481P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Le principe et le développement par Bernard Lyot du
coronographe.
Authors: Pecker, J. -C.
1980CRASB.291...79P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Active Sun as a Star
Authors: Pecker, J. C.
1980jfss.conf....1P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: L'Union Astronomique Internationale vit...
Authors: Pecker, J. -C.
1980LAstr..94..527P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Andreí Brahic received the Prix Lalande-Valz.
Authors: Pecker, J. -C.
1980CRASB.291R.122P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Magnetic Field Flux in Facular Regions
Authors: Mouradian, Z.; Chapman, G.; Dumont, S.; Fang, Ch.; Feng,
Y.; Pecker, J. C.
1980jfss.conf..121M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Discussion of the Semi-Empirical Determinations of the Optical
Depth of Chromosphere-Corona Transition C IV Lines
Authors: Pecker, J. C.; Dumont, S.; Mouradian, Z.; Chipman, E. G.
1980jfss.conf..118P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Roger Bonnet received the Prix Deslandres.
Authors: Pecker, J. -C.
1980CRASB.291Q.122P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: André Couder et l'optique astronomique.
Authors: Pecker, J. -C.
1980LAstr..94..149P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Literature references, journal abbreviations, and the IAU
Authors: Pecker, J. C.
1979Obs....99..220P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: P. Lena received the Prix Benjamin Valz.
Authors: Pecker, J. -C.
1979CRASB.289...95P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Documentation
Authors: Pecker, J. C.
1979IAUTA..17a...7P Altcode: 1979IAUT...17....7P
No abstract at ADS
---------------------------------------------------------
Title: A Meeting on the Nomenclature of Astronomical Objects
Authors: Jaschek, C.; Pecker, J. -C.
1979BICDS..16...57J Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Compte rendu sur la 17<SUP>e</SUP> Assemblée générale de
l'Union astronomique internationale qui s'est tenue à Montréal,
du 14 au 23 août 1979.
Authors: Pecker, J. -C.
1979CRASB.289...75P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Effect of spectral shifts in front of and near a massive body
on the profile of spectral lines emitted by this body or by other
bodies located behind it.
Authors: Borsenberger, J.; Pecker, J. -C.
1979BSRSL..48..204B Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Clouds in the halo.
Authors: Pecker, J. -C.
1978Msngr..15....2P Altcode:
Well, what can be done with ten nights on a future 25 metre telescope
(the VL T)? The first to send in his article was Professor Jean-Claude
Pecker from College de France and Institut d'Astrophysique in Paris. He
feels that most of the time should be used to study the stars and the
gas in the halo of the Mi/ky Way. Join him on the magic carpet . .. but
remember to fasten the seatbelts!
---------------------------------------------------------
Title: Un étonnant paradoxe sur la chute de corps Les lecteurs de
l'Astronomie trouveront-ils par doxal le raisonnement de Jean-Claude
PECKER
Authors: Pecker, J. -C.
1978LAstr..92..142P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Book reviews
Authors: Plavec, Miroslav; Hoekstra, R.; de Jager, C.; Grygar, Jiři;
Otterman, J.; van den Dool, H. M.; Namba, O.; Gunsing, C. J. Th.;
Pecker, Jean-Claude; Kwee, K. K.; Perek, L.; Callebaut, D.; Kuijpers,
Jan; de Graaff, W.; Reijnen, G. C. M.; Swanenburg, B.; Grevesse,
N.; Kleczek, J.; Piquet, P.; Fokker, A. D.; van Bueren, H. G.; Page,
D. Edgar; van Duinen, R. J.; Pacini, Franco
1978SSRv...21..469P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: H II regions around sources of intense ultraviolet radiation.
Authors: Pecker, J. -C.
1978bs...symp..285P Altcode:
An attempt is made to describe some particular cases where improvements
in the analysis of a classical Stromgren sphere are required. Attention
is given to problems involved in counting ionizing photons and
determining the respective sizes of He III, He II, and He I Stromgren
spheres around OB stars. The problem of computing the size and shape
of H II regions around nuclei of young galaxies is also discussed.
---------------------------------------------------------
Title: Francois Roddier received the Prix DesLandres.
Authors: Pecker, J. -C.
1978CRASB.287..107P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Guy Israel received the Prix Henri de Parville.
Authors: Pecker, J. -C.
1978CRASB.287..113P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: La théorie des atmosphères stellaires: tendances actuelles
Authors: Pecker, J. -C.
1978ppeu.book..293P Altcode: 1978ppeu.book..321P; 1978ppeu.conf..293P
No abstract at ADS
---------------------------------------------------------
Title: Livre d'Astronomie
Authors: Pecker, J. -C.
1977LAstr..91..268P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Resonance line polarization: the line core.
Authors: Dumont, S.; Omont, A.; Pecker, J. C.; Rees, D.
1977A&A....54..675D Altcode:
Polarization effects in non-LTE line formation have been investigated by
the Feautrier (1964) method for semiinfinite plane-parallel atmospheres
and Doppler frequency redistribution. The influence of the probability
of photon destruction during scattering and the error introduced by
the assumption of completed redistribution are discussed in the case
of isothermal atmospheres. The treatment is then extended to a model
simulating the main features of the solar chromosphere and photosphere,
and the influence of line strength in such conditions is discussed
under the assumption of complete redistribution. In the different
cases, the polarization rate of the emitted light is computed as a
function of frequency and direction, and the two source functions are
calculated as a function of optical depth.
---------------------------------------------------------
Title: La Nouvelle astronomie : science de l'univers
Authors: Pecker, Jean Claude; Baglin, Annie
1977nasu.book.....P Altcode: 1977QB44.2.P4......
No abstract at ADS
---------------------------------------------------------
Title: Infrared astronomy and galactic dust. II.
Authors: Pecker, J. -C.; Rodionova, S. N.
1977ZemVs...5...43P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Possible Explanations of Non Cosmological Redshift
Authors: Pecker, J. -C.
1977dreu.coll..451P Altcode: 1977egic.conf..451P; 1977IAUCo..37..451P
Possible causes of abnormal redshifts are considered. The
interpretations examined include perturbations of relativistic
cosmologies, Segal's (1975) chronogeometry, variations in
physical constants, and tired-light mechanisms, particularly that
involving neutral light phi-particles. The phi-particle mechanism
is investigated in detail, concentrating on the kinematics and
dynamics of the phi-photon interaction, the special case of strong
phi-photon interactions, and processes affecting the equilibrium of
phi-particles. Some general consequences of this tired-light mechanism
are discussed.
---------------------------------------------------------
Title: L'astronomie infrarouge et les poussières galactiques.
Authors: Pecker, J. -C.
1977HiA.....4A...3P Altcode: 1977HiA.....4....3P
No abstract at ADS
---------------------------------------------------------
Title: Infrared astronomy and galactic dust. I.
Authors: Pecker, J. -C.
1977ZemVs...4...30P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Société Astronomique de France : réunion des commissions
Authors: Pecker, J. -C.
1976LAstr..90..463P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Additional evidence and possible interpretation of angular
redshift anisotropy.
Authors: Jaakkola, T.; Karoji, H.; Le Denmat, G.; Moles, M.; Nottale,
L.; Vigier, J. -P.; Pecker, J. -C.
1976MNRAS.177..191J Altcode:
An attempt is performed to see whether the anisotropic angular
distribution of redshifts discovered by Rubin, Ford, and Rubin (1973)
for Sc I galaxies (denoted the RFR effect) exists for other types of
sources. The data used consists of brightest cluster galaxies, those for
which supernovae serve as distance indicators, and Seyfert galaxies. The
statistical analysis reveals in all three cases a similar anisotropy
at intermediate distances as that previously found. A modification of
the RFR borderline, analyzed in particular with a complete sample of
radio galaxies, shows that this anisotropy can be interpreted either
as an enhancement of the luminosity, or as an excess of redshift, when
galaxies are seen through intervening clusters of galaxies. This effect
is evidently connected with anomalous redshifts recently discussed in
the literature.
---------------------------------------------------------
Title: Progrès récents de l'astronomie
Authors: Pecker, J. -C.
1976LAstr..90..453P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Éditorial: Quand les astronomes deviennent géologues
Authors: Pecker, J. -C.
1976LAstr..90..413P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Universe 76
Authors: Pecker, J. -C.
1976Sc&Te.......32P Altcode:
A broad nonquantitative overview is presented of concepts,
theories, and disputes on the nature of the Universe, as totality
of perceptible objects in space and as model(s) and distributions of
physical quantities. The physics of stars, the interstellar medium,
and quasi-stellar phenomena, a concept of the Universe as rotating
flat disk with halo, and support or challenge to models proposed on
the basis of statistically derived evidence are sketched. Clusters
of galaxies, superclusters, and the local Supergalaxy are discussed,
in addition to the problems introduced by anomalous redshifts and the
nonconstancy of the Hubble constant.
---------------------------------------------------------
Title: Allocution du président sortant
Authors: Pecker, J. C.
1976LAstr..90..449P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Éditorial : L'Union Astronomique Internationale à Grenoble
Authors: Pecker, J. -C.
1976LAstr..90..365P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Rapport du président 1975-1976
Authors: Pecker, J. C.
1976LAstr..90..395P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Éditorial : Comment devenir astronome?
Authors: Pecker, J. -C.
1976LAstr..90..321P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Solar Astrophysics: Ghettosis from, or Symbiosis with,
Stellar and Galactic Astrophysics?
Authors: Pecker, J. -C.; Thomas, R. N.
1976SSRv...19..217P Altcode:
The purpose of the paper is to show how the solar-stellar symbiotic
approach has led to the modeling of a star as a concentration
of matter and energy. By 'solar-stellar symbiosis' is meant the
philosophy of investigation according to which one asks what change
in our general understanding of stellar structure and of stellar
spectroscopic diagnostics is required to satisfy both the sun and an
unusual star when, for example, some feature of an unusual star is
discovered. The evolution of stellar models is traced, from walled,
thermodynamic-equilibrium models to de-isolated models featuring
transition zones and nonlocal thermodynamic equilibrium.
---------------------------------------------------------
Title: Some doubts about Hubble's constant
Authors: Nottale, L.; Vigier, J. -P.; Yourgrau, W.; Pecker, J. -C.
1976Rech....7..529N Altcode:
Recent observations casting doubt on the uniformity of Hubble's constant
are discussed, and the hypotheses that have been proposed to explain
these observations are outlined. Rubin, Ford, and Rubin (1973) have
reported variations in the distribution of the radial velocities of
Sc I galaxies. In addition, a correlation has been found between the
degree of red shift of the light of distant galaxies and the mass of
galaxies which it must traverse to reach the observer. It has been
suggested by several workers that these effects are the result of
the interaction of photons with extremely light, neutral particles,
designated phi particles, as the result of which photons suffer a loss
of energy. Hubble's law is recovered from this model if the density
of phi particles is assumed to be globally constant. It has been
suggested that the rate of expansion of the universe is nonuniform,
with a higher value at the interior of galaxy clusters.
---------------------------------------------------------
Title: Éditorial : Flammarion et la météorologie
Authors: Pecker, J. -C.
1976LAstr..90..277P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: A set of working hypotheses towards a unified view of the
universe.
Authors: Pecker, J. -C.; Vigier, J. P.
1976Afz....12..315P Altcode:
The universe is considered as a hierarchical universe similar to
Charlier's and the cause of the apparent expansion in the interactions
affecting the path of photons is investigated on the basis of
observational data on the anisotropy and inhomogeneity of the Hubble
constant and on anomalous red shifts. The cosmology is formulated on
the basis of three working hypotheses: (1) most red shifts that are
considered anomalous are real not spurious, (2) the real anomalous red
shifts are due to unknown causes, and (3) the observed anomalous red
shifts, whether detected in objects passing behind the solar corona,
in binary stars, or in compact extragalactic objects, are due to a
single physical cause.
---------------------------------------------------------
Title: Éditorial : La pollution et l'astronomie
Authors: Pecker, J. -C.
1976LAstr..90..221P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Livres d'astronomie
Authors: Pecker, J. -C.
1976LAstr..90..207P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Éditorial : La constante de la gravitation universelle
est-elle variable?
Authors: Pecker, J. -C.
1976LAstr..90..173P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Températures et magnitudes en astrophysique : Un aide-mémoire
Authors: Pecker, J. -C.
1976LAstr..90..191P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: A set of working hypotheses toward a unified view of the
universe
Authors: Pecker, J. -C.; Vigier, J. P.
1976Ap.....12..195P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Éditorial : Des parentés nouvelles avec les biologistes
Authors: Pecker, J. -C.
1976LAstr..90..117P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Commissions de la Société Astronomique de France
Authors: Pecker, J. -C.
1976LAstr..90...51P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Documentation (Committee of the Executive Committee).
Authors: Pecker, J. -C.; Wilkins, G. A.
1976IAUTA..16a.189P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Retour sur la météorologie solaire
Authors: Pecker, J. -C.
1976LAstr..90....1P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: F. Praderie received the Prix Antoine d'Abbadie.
Authors: Pecker, J. -C.
1976CRASB.283R..89P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: A propos du spectre solaire
Authors: Pecker, J. -C.
1976LAstr..90...33P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: S. Collin-Souffrin received the Prix Antoine d'Abbadie.
Authors: Pecker, J. -C.
1976CRASB.283Q..89P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Allocution
Authors: Pecker, J. -C.
1975LAstr..89..402P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Progrès récents de l'astronomie
Authors: Pecker, J. -C.
1975LAstr..89..434P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Editorial : Le Soleil, la Galaxie et les périodes de
glaciation
Authors: Pecker, J. -C.
1975LAstr..89..351P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Sur les dangers d'une approximation classique dans l'analyse
des décalages spectraux vers le rouge.
Authors: Pecker, J. -C.; Vigier, J. -P.
1975CRASB.281..369P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Éditorial : Nouveaux regards sur un vieux problème
Authors: Pecker, J. -C.
1975LAstr..89..269P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Le cinquantième anniversaire de la mécanique ondulatoire
Authors: Pecker, J. -C.
1975LAstr..89..227P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Éditorial : du bon usage des ordinateurs
Authors: Pecker, J. -C.
1975LAstr..89..225P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Cosmological implications of anomalous redshifts—A possible
working hypothesis
Authors: Jaakkola, T.; Moles, M.; Vigier, J. P.; Pecker, J. C.;
Yourgrau, W.
1975FoPh....5..257J Altcode:
An analysis of the most recent experimental data shows that the
isotropic and universal proportionality of redshift to distance,
predicted for all distant objects by the expanding universe model,
cannot be regarded as an established fact at the present stage of
experimental knowledge. An interpretation of the conflicting data
is given in terms of interactions between nonzero-mass photons and
light scalar bosons. This leads to a new, static, Einstein-type
hierarchical model of the universe, where the cosmological redshift
results essentially from a tired-light effect.
---------------------------------------------------------
Title: Éditorial : A propos des parallaxes stellaires
Authors: Pecker, J. -C.
1975LAstr..89..177P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Éditorial Un problème mal résolu : la composition des
étoiles
Authors: Pecker, J. -C.
1975LAstr..89..129P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The abundance determination in a stellar atmosphere. I. LTE
experimentation using an artificial non-LTE spectrum.
Authors: Dumont, S.; Heidmann, N.; Jefferies, J. T.; Pecker, J. -C.
1975A&A....40..127D Altcode:
It is shown that the classical LTE analysis of an atomic spectrum
of a solar-like star leads to values of the abundance (A) which may
be different from the real values. Various uncertainties affect the
results derived from neutral lines. However, proper selection of
the observational data, for instance use of ion lines, can lead, in
similar cases at least, to good values of A. These conclusions concern
the solar-like case; however, they emphasize that, in all cases,
the effect of departures from LTE needs very careful discussion.
---------------------------------------------------------
Title: Charles Greeley Abbot (1872-1973)
Authors: Pecker, J. -C.
1975LAstr..89..118P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Éditorial : Une observation révolutionnaire?
Authors: Pecker, J. -C.
1975LAstr..89...89P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: G. Kuiper (1905-1973)
Authors: Pecker, J. -C.
1975LAstr..89...84P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Une réunion commune à toutes les Commissions de la Société
Astronomique de France : Introduction
Authors: Pecker, J. -C.
1975LAstr..89...50P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Éditorial : L'Europe à l'heure du Soleil
Authors: Pecker, J. -C.
1975LAstr..89...49P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: L'année Camille Flammarion
Authors: Pecker, J. -C.
1975LAstr..89....1P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Promotion of solar physics in Europe: introduction to a debate.
Authors: Pecker, J. C.
1975MmArc.105..125P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: La nouvelle astronomie : science de l'univers
Authors: Pecker, Jean Claude; Baglin, Annie
1975nasu.book.....P Altcode: 1975QB44.2.P4......
No abstract at ADS
---------------------------------------------------------
Title: Computation and tables of a useful integral for the
interpretation of phenomena near the solar limb (or stellar disk).
Authors: Borsenberger, J.; Pecker, J. -C.; Vigier, J. -P.
1975BSRSL..44..706B Altcode:
The functions J1 (proportional to the integrated value, along the line
of sight, of the solid angle under which the stellar disk is seen)
and J2 (proportional to the integrated value, along the line of sight,
of the gravitational field of the stellar mass) have been calculated
and tabulated. The integrals were evaluated by computer using the
Romberg method.
---------------------------------------------------------
Title: Comparaison de deux observations de déplacements anormaux
vers le rouge observés au voisinage du disque solaire (complément).
Authors: Depaquit, S.; Vigier, J. -P.; Pecker, J. -C.
1975CRASB.280..113D Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Promotion of solar physics in Europe: introduction to a debate
Authors: Pecker, J. C.
1975cesra...5..125P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The O-complex: the O stars and their gas-dust circumstellar
medium.
Authors: Pecker, J. -C.
1975MSRSL...9..319P Altcode: 1975assp.conf..319P; 1975apes.conf..319P
This paper, unlike most review papers, does not intend to cover and
describe the literature, but only to attract the reader's attention to
a rapidly evolving field, especially through the study of the typical
Orion complex. The diagnosis of spectra (properties of main component:
stars, gas, ionized or neutral, dusts, molecules) is covered; the
need for an integrated theoretical treatment is emphasized. A global
picture emerges from published data and is presented with some words
of caution concerning the weaknesses of such a model.
---------------------------------------------------------
Title: Progrès récents de l'astronomie
Authors: Pecker, J. -C.
1974LAstr..88..401P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Comparaison de deux observations de déplacements anormaux
vers le rouge observés au voisinage du disque solaire.
Authors: Depaquit, S.; Vigier, J. -P.; Pecker, J. -C.
1974CRASB.279..559D Altcode:
Comparison of the series of observations of anomalous redshifts made
by Sadeh et al. (1968) on the radio source Taurus A with the anomalous
redshift observed by Goldstein (1969) at the frequency emitted by the
Pioneer 6 satellite. Observing at a frequency of 2292 MHz, Goldstein
noted an anomalous redshift at the onset of occultation of the satellite
by the sun. This shift consists of a superposition of an asymmetrical
shift and a symmetrical shift. In a similar experiment, based on
observations of the 21-cm hydrogen absorption line, Sadeh et al. also
noted an anomalous redshift at the moment of solar occultation. An
interpretation and comparison of these redshifts are made by assuming
that the lost energy of the observed redshifts is carried away by
lightweight particles which are emitted at the surface of the sun and
strongly interact with gamma rays emitted by the source.
---------------------------------------------------------
Title: Éditorial. Échanges d'astronomes
Authors: Pecker, J. -C.
1974LAstr..88..357P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: A propos de l'éditorial « Faut-il encore observer le
Soleil? »
Authors: Pecker, J. -C.
1974LAstr..88..279P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Galactic evolution. II. Why is the reddening law in our Galaxy
unique? A working hypothesis.
Authors: Pecker, J. -C.
1974A&A....35....7P Altcode:
Based on calculations of the ratio of the force exerted by gravity
and the force due to radiation pressure on spherical dielectric
particles, it can be shown that dust grains of dimension greater than
0.000003 cm are retained by the Galaxy, while those smaller than that
are repulsed. However, grains greater than 0.00003 cm are attracted
by main sequence stars colder than A 5. Thus, only grains within the
range from 0.000003 to 0.00003 cm can remain for a relatively long
time in the Galaxy. This fact explains roughly why the reddening law
in the Galaxy has always been found to be nearly the same, except
in those particular regions where it reflects the circumstellar dust
grain distribution rather than the interstellar distribution.
---------------------------------------------------------
Title: Éditorial. Météorologie et activité solaire
Authors: Pecker, J. -C.
1974LAstr..88..277P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Editorial. Astrologie 1974
Authors: Pecker, J. -C.
1974LAstr..88..241P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Observed Deflation of Light by the Sun as a Function of
Solar Distance
Authors: Merat, P.; Pecker, J. C.; Vigier, J. P.; Yourgrau, W.
1974A&A....32..471M Altcode:
Summary. A detailed analysis using modern computing methods of all known
measurements of the deflection of light near the solar limb shows a)
the validity of Einstein's prediction beyond a certain distance of the
sun b) the possible existence of a new effect in the close vicinity of
the solar limb which can be interpreted as resulting from a dispersive
medium emitted by the solar surface. Key words: light deflection by
the sun
---------------------------------------------------------
Title: Éditorial - MHD en Astrophysique
Authors: Pecker, J. -C.
1974LAstr..88..153P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Anomalous redshifts in binary stars.
Authors: Kuhi, L. V.; Pecker, J. -C.; Vigier, J. P.
1974A&A....32..111K Altcode:
Summary. The problem of the anomalous redshifts (+ 100 km/s) of the
y-velocities of Wolf-Rayet binaries as deduced from the emission lines
is reviewed. The earlier explanations (Wilson, 1940 b) are rediscussed
and it is shown that while the absorption hypothesis is very attractive
similar redshifts can also be produced by inelastic photon boson
scattering. Key words: redshifts - binaries - Wolf-Rayet stars
---------------------------------------------------------
Title: Éditorial : L'astronomie dans l'enseignement secondaire
français
Authors: Pecker, J. -C.
1974LAstr..88..113P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Retour sur Copernic, Kepler, Bessel et les parallaxes
Authors: Pecker, J. -C.
1974LAstr..88...83P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Editorial - Amas de galaxies en expansion?
Authors: Pecker, J. -C.
1974LAstr..88...41P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: L'astronomie infrarouge
Authors: Pecker, J. -C.
1974LAstr..88...57P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Pourquoi un éditorial?
Authors: Morando, B.; Pecker, J. -C.
1974LAstr..88....1M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: On the Compactness and Redshifts of Companion Galaxies Members
of Groups of Galaxies
Authors: Collin-Souffrin, S.; Pecker, J. -C.; Tovmassian, H. M.
1974A&A....30..351C Altcode:
Summary. In groups of galaxies, although the brightest galaxy of the
group has often a compact nucleus, the companion galaxies are more
clearly red shifted when they are a compact nucleus themselves. Although
the sample of galaxies studied in this paper is rather limited,
it seems that compactness, altogether, favors red shift. Key words:
galaxies - red shift - groups of galaxies
---------------------------------------------------------
Title: La méthode de Kepler est-elle une non-méthode?
Authors: Pecker, J. -C.
1974LAstr..88....2P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: L'univers est-il EN expansion? : expose
Authors: Pecker, Jean Claude
1974ueee.book.....P Altcode: 1974QB981.P415.....
No abstract at ADS
---------------------------------------------------------
Title: Asymmetry in solar spectral lines.
Authors: Magnan, C.; Pecker, J. C.
1974HiA.....3..171M Altcode:
After reviewing observations of the spectral solar features originated
either in the chromospheric layers or in the photospheric layers,
from the point of view of the observations, and after having shown
the strikingly discrepant set of interpretations that can be found
currently in literature, a numerical experiment is performed in a case
not too different from the solar case. It is shown that the use of
the line bisector to determine, from the asymmetry of a single line,
the trend of the velocity field might be considerably misleading,
a fact which explains partly the results published in literature.
---------------------------------------------------------
Title: Possible Interpretation of an Anomalous Redsbift Observed on
the 2292 MHz Line Emitted by Pioneer-6 in the Close Vicinity of the
Solar Limb
Authors: Merat, P.; Pecker, J. -C.; Vigier, J. -P.
1974A&A....30..167M Altcode:
Summary. An analysis of Goldstein's observations shows an anomalous
redshift of the central frequency of the 2292 MHz band emitted by
Pioneer-6 during its occultation by the sun. This shift, symmetrical
with respect to the sun's center, does not correspond to any presently
known physical effect. It can be quantitatively interpreted through
an interaction between incident transverse photons and light neutral
bosons emitted by the sun, an interaction of the type proposed earlier
by the authors. Key words: anomalous redshifts - Pioneer-6 occultation -
solar redshift observations
---------------------------------------------------------
Title: A Scheme of Stellar Atmospheric Regions. I. The General
Approach
Authors: Pecker, J. -C.; Praderie, F.; Thomas, R. N.
1973A&A....29..289P Altcode:
Summary. We develop the idea of the stellar atmosphere as a transition
zone between the quasi-equilibrium stellar interior and the wholly
non-equilibrium interstellar medium. The transition is between a
primarilystorage, and a primarily-propagation, configuration for the
energy associated with each of the radiation and mass-fluxes. Each phase
of the transition, for the radia tive flux, gives rise to one region of
the photosphere; for the mass-flux, to one region of the hylosphere. We
provide a schematic outline of the phases in this paper. Key words:
transition-zone - mass-flux - radiation- flux - stellar atmosphere
---------------------------------------------------------
Title: La méthode de Kepler est-elle une non-méthode ?
Authors: Pecker, J. -C.
1973LAstr..87..427P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Protostellar Origin of Circumstellar Envelopes
Authors: Baglin, A.; Berruyer, N.; Morel, P. J.; Pecker, J. C.
1973ApL....15....9B Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Dimensions of ionized-gas zones surrounding sources of strong
ultraviolet radiation: I. Physics of the problem and methods of
calculations
Authors: Pecker, J. C.
1973Ap......9..318P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Photon Mass, Quasar Redshifts and Other Abnormal Redshifts
Authors: Pecker, J. C.
1973Natur.241..338P Altcode:
As stated in a recent Nature editorial<SUP>1</SUP> “the first claims
that quasar redshifts were not caused by Doppler velocities of recession
were met with general disbelief”. In spite of this, experimental
evidence has been accumulating in favour of such non-velocity shifts
(see, for example, refs. 2, 3). Burbidge (unpublished) has shown
a significant anti-correlation between the apparent distance of a
quasar and a nearby galaxy and the brightness of that galaxy (hence a
correlation with its distance): this suggests a physical association,
in many cases, between two objects, a QSO and an ordinary galaxy,
displaying very different redshifts.
---------------------------------------------------------
Title: Theoretical study of the Fraunhofer lines polarization:
The case of Ca i 4227
Authors: Dumont, Simone; Pecker, Jean-Claude; Omont, Alain
1973SoPh...28..271D Altcode:
The measurements by Brückner (1963) of the Ca I 4227 polarization
at the Sun's limb provides us with a test for the theory of line
polarization. Computations are developed taking into account: (a)
the transfer polarization, due to the anisotropy of radiation field;
(b) the depolarizing collisions acting in the wings. The magnetic field
is not taken into account and the theory is not valid in the Doppler
core. In the wings a very good fit is obtained, using appropriate
source-functions fitting the observed profiles at the center of the
disk, and from center to limb.
---------------------------------------------------------
Title: Astronomy, the people and the governments
Authors: Pecker, Jean-Claude; Ringeard, Gisèle
1973VA.....15....1P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Use of Model Atmosphere for Temperature-Gravity Calibration
(survey Lecture)
Authors: Pecker, J. C.
1973IAUS...54..173P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Les molécules dans l'espace: leur découverte, leur
importance.
Authors: Pecker, J. -C.
1973CRASB.277..149P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Experimental astronomy.
Authors: Pecker, J. -C.
1973exas.book.....P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Dimensions of the zones of ionized gas around the sources of
strong ultraviolet radiation. I. Physics of the problem and principles
of calculation.
Authors: Pecker, J. -C.
1973Afz.....9..525P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Rapport d'activité de l'ADION par le Secrétaire Général
et rapport financier. Report 1972.
Authors: Pecker, J. -C.
1973BINic..10...19P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: La dixième médaille de l'ADION décernée au Professeur
L. Perek
Authors: Pecker, J. -C.
1972LAstr..86..366P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Non-velocity Redshifts and Photon-Photon Interactions
Authors: Pecker, J. C.
1972Natur.237..227P Altcode:
RECENT data on galactic redshift anomalies have led Hoyle and
Narlikar<SUP>1</SUP>, for example, to propose a qualitative explanation
in terms of spatio-temporal variation of proper mass. The consequences
of hypotheses such as this are evidently worthy of study, but there
are other redshift anomalies, which should also be considered in
this context. A possible alternative explanation is in terms of an
inelastic photon-photon interaction; this has the advantages of being
more inclusive, more quantitative (at least in order of magnitude)
and immediately testable in the laboratory.
---------------------------------------------------------
Title: Galactic Evolution. I. Differential Effects of Radiation
Pression around Stars of Different Spectral Types on Neutral Atoms
and Dust Grains
Authors: Pecker, J. -C.
1972A&A....18..253P Altcode:
The ratios, and actual values, for forces exerted both by radiation
pressure and gravitation on atoms of H 1, He 1, C 1, Fe 1, Eu i, and
on dust grains of various sizes are computed, at a large distance of
the star, for stars of all spectral types (assuming that the medium is
essentially neutral, and that atoms are in the ground state) and for a
schematical galaxy. Clearly, the effects of gravitation and radiation
act in such a way as to produce a definite difference in the dynamics
of different atomic species and of dust grains of different sizes. A
sorting of metals from hydrogen is suggested; first, hydrogen would
be strongly expelled; next, hydrogen would be less strongly expelled,
whenever metals would not follow; finally, hydrogen would fall again,
as dust would. Expulsion would be mostly polar; subsequent partial
return of matter would be mostly equatorial. The study of this
dynamical behaviour is described in subsequent papers. Key words:
galaxy - galactic evolution - interstellar medium - dust - radiation
pressure Les rapports, et valeurs absolues, des forces exerc6es d'une
part par la pression de radiation, d'autre part par Ia gravitation,
sur des atomes de H 1, He i, C 1, Fe i, Eu i, et sur des grains
de de dimensions , sont , une grande distance de l'e'toile, pour
des toiles de tous les types spectraux (en supposant que le milieu
est essentiellement neutre et les atomes dans l'e'tat fondamental)
et pour une galaxie . De toute vidsnce, les effets de la gravitation
et du rayonnement ont pour effet de provoquer des sensibles dans le
comportement dynamique des diff&ents atomes et des grains de de
diff&entes dimensions. Une s6paration entre et est sugg e; l'
d'abord serait expuls fortement; puis il le serait moins fortement,
et les ne le suivraient pas encore; enfin, l' , comme d'ailleurs les
, retomberait sur la Galaxie. L'expulsion serait surtout polaire;
le retour essentiellement equatorial. L' tude de ce comportement
dynamique est decrite dans les articles sulvants de cette .
---------------------------------------------------------
Title: Rapport d'activité de l'ADION par le Secrétaire
Général. Report 1971.
Authors: Pecker, J. -C.
1972BONic...9...25P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Sur une interprétation possible du déplacement vers le
rouge des raies spectrales dans le spectre des objets astronomiques.
Authors: Pecker, J. -C.; Roberts, A. P.; Vigier, J. -P.
1972CRASB.274..765P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Le ciel, et deux etudes.
Authors: Pecker, Jean Claude
1972cde..book.....P Altcode: 1972QB44.2.P39.....
No abstract at ADS
---------------------------------------------------------
Title: Données de l'observation et de la théorie et prévisions
concernant les spectres (IR et ondes ultracourtes) des étoiles
normales et particulières de type peu avancé. Rapport introductif.
Authors: Pecker, J. -C.
1972saim.conf..243P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Sur une interprétation possible du déplacement vers
le rouge des raies spectrales dans le spectre des objets
astronomiques. Suggestions en vue d'expériences directes.
Authors: Pecker, J. -C.; Roberts, A. P.; Vigier, J. -P.
1972CRASB.274.1159P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Le ciel et deux écrits.
Authors: Pecker, J. -C.
1972lced.book.....P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Processus physiques intéressant les poussières
circumstellaires. Masse des grains et accrétion protonique.
Authors: Pecker, J. -C.
1972CRASB.274.1001P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Le tri des atomes et des grains de poussière au voisinage
d'une galaxie, l'évolution de cette galaxie, et l'observation,
dans les domaines IR et radio, de son rayonnement.
Authors: Pecker, J. -C.
1972saim.conf..573P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Book reviews
Authors: Chup, E. L.; Koelbloed, D.; de Jager, C.; Quenby, J. J.; van
Kampen, N. G.; Pettengill, G. H.; Schuurmans, C. J. E.; de Graaff, W.;
Oort, J. H.; Sagan, Carl; van der Kerk, G. J. M.; Pecker, Jean-Claude;
Szebehely, V.; Hutchinson, G. W.; Allan, H. R.
1971SSRv...12..526C Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Marcel Gilles Josef Minnaert (1893-1970)
Authors: Pecker, Jean-Claude
1971Icar...15..147P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: La quatorzième Assemblée générale de l'Union Astronomique
Internationale à Brighton
Authors: Pecker, J. -C.
1971LAstr..85...93P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Influence of the Line Absorption on the Polarization of the
Continuum Spectrum
Authors: Dumont, S.; Pecker, J. -C.
1971A&A....10..118D Altcode:
The polarization in Fraunhofer lines is computed from a detailed
statistical analysis of five spectral bands of the solar spectrum. The
assumptions, that are necessary to treat several thousands of lines,
are necessarily rather crude: rectangniar profiles; lines divided in to
four categories: weak-pure absorption; averaged strongpure absorption;
weak-pure scattering; averaged strong-pure scattering. The results
show that the line resonance polarization is of the right order of
magnitude to explain the observations; but that a proper treatment of
collisional depolarization and new measurements are highly necessary
to reach definitive conclusions. Key words: sun - polarization
---------------------------------------------------------
Title: Processus physiques intéressant les grains de poussière
circumstellaires: Charge et effet photoélectrique.
Authors: Pecker, J. -C.
1971CRASB.272...69P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: La nouvelle astronomy. Science de l'univers
Authors: Pecker, Jean Claude; Baglin, Annie
1971lnas.book.....P Altcode: 1971QB44.2.P4......
No abstract at ADS
---------------------------------------------------------
Title: Some Considerations from the Direct Comparison between the
Observations and the Theory of Solar Disk Polarization
Authors: Pecker, Jean-Claude
1970SoPh...15...88P Altcode:
Simple considerations of observed variation with wavelength of
polarization on the solar disc, computed continuum polarization, and
estimated line polarization have led to the following simple conclusions
(more qualitative than quantitative); (a) The metal abundances in the
photosphere are five times larger than the `classical' values adopted in
the BCA model of the solar photosphere. (b) The depolarization factor
k in lines is an increasing function of wavelength. (c) Assuming that
k varies as λ<SUP>2</SUP>, an additional polarization (which can be
either solar or instrumental) has to be taken into account.
---------------------------------------------------------
Title: Saturation in Fraunhofer lines
Authors: Pecker, J. -C.; Thomas, R. N.
1970Obs....90..207P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Polarization of Continuum at the Solar Limb
Authors: Debarbat, S.; Dumont, S.; Pecker, J. C.
1970A&A.....8..231D Altcode:
The classical expressions for the source function lead to an estimate
of the polarization rate at the solar limb at various wavelengths. Two
methods have been used; in both cases the computed polarization has been
compared to the observations by Dollfus and Leroy (1960). An attempt
has been made to justify the models introduced in the computation
through an inversion of the expression of the polarization rate. For
the models considered in this paper, the computed polarization is too
weak by a factor 3 to 6. It seems necessary to take into account,
as the main contributor to this factor, the effect of Fraunhofer
lines. The comparison of the observed and computed polarization rates
suggest however that another additional phenomenon should be invoked
to explain the discrepancy. Th order to improve our understanding of
this question, the study of the effect of lines has to be pursued (work
is now in progress); but it would be necessary as well to obtain new
observations in the visible and to extend them to other wavelengths,
especially in the ultra-violet.
---------------------------------------------------------
Title: Polarization at the Solar Limb: Interpretation
Authors: Pecker, Jean-Claude
1970BAAS....2R.335P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Interpretation of Optical Solar Polarization
Authors: Debarbat, S.; Dumont, S.; Pecker, J.
1970ApL.....6..251D Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Concluding Remarks
Authors: Pecker, J. C.
1970sfss.coll..323P Altcode: 1970IAUCo...2..323P
No abstract at ADS
---------------------------------------------------------
Title: Space observatories
Authors: Pecker, Jean-Claude
1970ASSL...21.....P Altcode: 1970QB81.P413......; 1970spob.book.....P
No abstract at ADS
---------------------------------------------------------
Title: Experimental astronomy
Authors: Pecker, Jean-Claude
1970ASSL...18.....P Altcode: 1970QB471.P413.....; 1970exas.book.....P
No abstract at ADS
---------------------------------------------------------
Title: Part C Chromospheres and Coronae of Stars
Authors: Pecker, J. C.; Hummer, D. G.
1970sfss.coll..239P Altcode: 1970IAUCo...2..239P
No abstract at ADS
---------------------------------------------------------
Title: Astrophysique théorique.
Authors: Pecker, J. -C.
1970AnCF...70...93P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Rapport d'activité de l'Observatoire de Nice pour 1969.
Authors: Pecker, J. -C.
1970BINic...7...39P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: On the Abundance Determination in the Solar Chromosphere
Authors: Pecker, J. C.; Pottasch, S. R.
1969A&A.....2...81P Altcode:
We show that abundances of the metals can be obtained from observations
of the solar chromosphere; departures from local thermodynamic
equilibrium are taken into account. Results are given for iron,
titanium, scandium, strontium and barium.
---------------------------------------------------------
Title: L'Astronomie experimentale ...
Authors: Pecker, Jean Claude
1969asex.book.....P Altcode: 1969QB47.P4........
No abstract at ADS
---------------------------------------------------------
Title: Les observatoires spatiaux.
Authors: Pecker, J. -C.
1969los..book.....P Altcode: 1969QB81.P4........
No abstract at ADS
---------------------------------------------------------
Title: La XIIIe assemblée générale de l'Union astronomique
internationale
Authors: Pecker, J. -C.
1968LAstr..82..263P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Saturation in Fraunhofer lines
Authors: Pecker, J. -C.; Thomas, R. N.
1968Obs....88..115P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: La formation des raies d'émission dans les couches gazeuses
d'épaisseur optique finie
Authors: Pecker, J. -C.
1968AnAp...31..537P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: RS Ophiuchi: Reduction of spectra from the 1958 outburst
(Errata: 20 224)
Authors: Tolbert, C. R.; Pecker, J. C.; Pottasch, S. R.
1967BAN....19...17T Altcode:
No abstract at ADS
---------------------------------------------------------
Title: M. -G. -P. Minnaert
Authors: Pecker, J.
1966LAstr..80..383P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Le rôle de la Société Astronomique de France
Authors: Pecker, J. -C.
1966LAstr..80...97P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: L'Observatoire de Nice (1881-1964)
Authors: Pecker, J. -C.
1965LAstr..79..201P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Micromotions, Macromotions, and Non-LTE Effects
Authors: Pecker, J. -C.; Roddier, F.
1965SAOSR.174..437P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Sur une interprétation possible de la phase oscillatoire
des Novae
Authors: Pecker, J. -C.
1965nns..conf..141P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: La Structure de la Photosphère
Authors: Pecker, Jean-Claude
1965ASSL....1...29P Altcode: 1965sosp.conf...29P
No abstract at ADS
---------------------------------------------------------
Title: Abaques pour le calcul des profondeurs de formation = Tesekkul
derinliklerinin hesaplanmasi icin abaklar
Authors: Balli, Edibe; Kiral, Adnan; Pecker, Jean Claude
1965acpf.book.....B Altcode: 1965QB551.B3.......
No abstract at ADS
---------------------------------------------------------
Title: Model Atmospheres
Authors: Pecker, Jean-Claude
1965ARA&A...3..135P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Balmer line profiles in Nova RS Ophiuchi 1958
Authors: Folkart, B.; Pecker, J. -C.; Pottasch, S. R.
1965nns..conf...60F Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The narrow emission and absorption lines in Nova RS Ophiuchi
1958
Authors: Folkart, B.; Pecker, J. -C.; Pottasch, S. R.
1965nns..conf...50F Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Balmer line profiles in Nova RS Ophiuchi, 1958
Authors: Folkart, B.; Pecker, J. -C.; Pottasch, S. R.
1964AnAp...27..249F Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Sur une interprétation possible de la phase oscillatoire
des novae
Authors: Pecker, J. -C.
1964AnAp...27..287P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The narrow emission and absorption lines in Nova RS Ophiuchi
Authors: Folkart, B.; Pecker, J. -C.; Pottasch, S. R.
1964AnAp...27..252F Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Note sur l'utilisation des courbes de croissance
Authors: Gökdoǧan, N.; Pecker, J. -C.
1964AnAp...27..417G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Le Spectre Ultraviolet des Etoiles
Authors: Pecker, Jean-Claude
1963SSRv....1..729P Altcode:
Le spectre ultraviolet des etoiles
---------------------------------------------------------
Title: Sur une généralisation de la théorie de Milne-Eddington
des courbes de croissance
Authors: Dubois-Salmon, Alain; Gökdogan, N. üzhet; Pecker, Jean
Claude.
1963NoPar...4.....D Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Interpretation of the UV Spectrum of Stars
Authors: Pecker, J. C.
1963spre.conf.1076P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Le spectre UV des étoiles et son intérpretation
Authors: Pecker, Jean Claude.
1963NoPar...1....5P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Relation of Corona to Prominences; Ionization and Excitation
of the Corona; Identification of Coronal lines. Discussion Leader:
Authors: Pecker, J. -C.
1963IAUS...16..285P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: L'observatoire de Nice et son avenir
Authors: Pecker, J. -C.
1963LAstr..77...24P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Le spectre ultraviolet des étoiles
Authors: Pecker, J. -C.
1962LAstr..76..307P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Écarts à l'équilibre et abondances dans les photosphères
solaires et stellaires. - VII. Les écarts à l'ETL dans le cas du Fer
Authors: Gökdoǧan, N.; Hotinli, M.; Pecker, J. C.
1962AnAp...25..324G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Etude sommaire des fonctions J<SUB>m</SUB>=[integral
symbol]b0s[ infinity symbol] gcs (x,a)e-x/[eta]b0s x<SUP>m</SUP>dx.
Authors: Gökdogan, N. üzhet; Pecker, Jean Claude.
1962NoPar...2.....G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: L'astronomie et la recherche spatiale
Authors: Pecker, J. C.
1962C&T....78..161P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Le Spectre ultra-violet du Soleil
Authors: Pecker, J. -C.
1961LAstr..75..307P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Écarts à l'équilibre et abondances dans les photosphères
solaire et stellaires. VI. La variation des intensités centrales
des raies métalliques entre le centre et le bord du Soleil
Authors: Lefèvre, J.; Pecker, J. -C.
1961AnAp...24..238L Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Profondeur de formation dans le spectre solaire. - II Tables
de profondeur de formation et courbes iso -τ*
Authors: Dumont, S.; Laloux, R.; Mouëllic, L.; Pecker, J. -C.
1961AnAp...24..328D Altcode:
No abstract at ADS
---------------------------------------------------------
Title: L'évolution des étoiles
Authors: Pecker, J. -C.
1961LAstr..75..141P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Equipment et Projets Francais. Rapport
Authors: Blamont, Jacques; Pecker, Jean-Claude
1961LIACo..10...45B Altcode: 1961LIACo..10...41B; 1961MSRSL...4...41B
No abstract at ADS
---------------------------------------------------------
Title: La Prediction du Spectre Ultraviolet des Etoiles et du
Soleil. Rapport introductif
Authors: Pecker, Jean-Claude
1961LIACo..10..487P Altcode: 1961LIACo..10..485P; 1961MSRSL...4..485P
No abstract at ADS
---------------------------------------------------------
Title: Les déterminations d'abondances et leurs exigences
expérimentales
Authors: Pecker, J. -C.
1960AnAp...23..366P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Influence des inhomogénéités sur l'intensit&eacute
centrale des raies de Fraunhofer
Authors: Cuny, Y.; Lefèvre, J.; Pecker, J. -C.
1960AnAp...23..923C Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Écarts à l'équilibre et abondances dans les photosphères
solaire et stellaires. - II. Les cas des atomes neutres de titane,
vanadium, chrome dans l'atmosphère solaire
Authors: Pecker, J. -C.; Vogel, L.
1960AnAp...23..594P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Profondeur de formation dans le spectre solaire. -
I. Application à l'inversion de la relation de Laplace
Authors: Dumont, S.; Pecker, J. -C.
1960AnAp...23..655D Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Écarts à l'équilibre et abondances dans les photosphères
solaire et stellaires. - III. Écarts à l'ETL dans la bande CH 4300
(cas solaire)
Authors: Eugène-Praderie, F.; Pecker, J. -C.
1960AnAp...23..622E Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Questions of general background and methodology relating to
aerodynamic phenomena in stellar atmospheres - Summary-introduction
Authors: Pecker, J. -C.; Thomas, R. N.
1960IAUS...12....1P Altcode: 1960IAUS...12Q...1.
No abstract at ADS
---------------------------------------------------------
Title: Buchbesprechungen über: Astrophysique Générale
(Ref. K. H. BÖHM)
Authors: Pecker, J. C.; Schatzman, E.
1960ZA.....50...76P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Orien book of the sky.
Authors: Pecker, Jean Claude
1960obk..book.....P Altcode: 1960QB44.P423......
No abstract at ADS
---------------------------------------------------------
Title: Écarts à l'équilibre et abondances dans les photosphères
solaire et stellaires: I. Le spectre du Titane neutre. Écarts à
l'E. T. L.
Authors: Pecker, J. C.
1959AnAp...22..499P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: 34. La zone convective des etoiles: rapport introductif
Authors: Pecker, J. C.
1959LIACo...9..343P Altcode: 1959MSRSL...3..343P
No abstract at ADS
---------------------------------------------------------
Title: Astrophysique generale
Authors: Pecker, J. C.; Schatzman, E.
1959asge.book.....P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Activité solaire et magnétisme terrestre
Authors: Pecker, J. -C.
1958LAstr..72..485P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Part VIII: Summaries and Conclusions
Authors: Burgers, J. M.; Liepmann, H.; van de Hulst, H. C.; Kahn,
F. D.; Seaton, M. J.; Pecker, J. C.; Schatzman, E.; Spitzer, L., Jr.
1958RvMP...30.1095B Altcode: 1958IAUS....8.1095B
No abstract at ADS
---------------------------------------------------------
Title: La détermination de la composition chimique des étoiles et
du Soleil
Authors: Pecker, J. -C.
1958LAstr..72...93P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Les systèmes planétaires dans I'Univers
Authors: Pecker, J. -C.
1958LAstr..72...61P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Le rayonnement radioélectrique du soleil à différentes
phases du cycle solaire
Authors: Débarbat, S.; Pecker, J. C.
1958AnAp...21..250D Altcode:
No abstract at ADS
---------------------------------------------------------
Title: L'Interpretation des Variations des Bandes Moleculaires Entre
le Centre et le Bord du Disque Solaire
Authors: Pecker, Jean-Claude
1957LIACo...7..332P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Les Constantes de Dissociation des Molecules Diatomiques
D'Interet Astrophysique
Authors: Pecker, J. C.; Peuchot, M.
1957LIACo...7..352P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Du Soleil à la Terre
Authors: Pecker, J. -C.
1956LAstr..70...27P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Thermodynamic State of the Outer Solar Atmosphere. III,
IV, and V.
Authors: Athay, S.; Matsushima, R. G.; Athay, R. N.; Thomas, R. G.;
Menzel, D. H.; Pecker, J. -C.; Thomas, R. N.
1955ApJ...121..775A Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Thermodynamic State of the Outer Solar ATMOSPHERE.V.A.MODEL
of the Chromosphere from the Continuum Emission.
Authors: Athay, R. G.; Menzel, D. H.; Pecker, J. -C.; Thomas, R. N.
1955ApJS....1..505A Altcode:
Four semi-independent analyses of 1952 eclipse data contribute to a
determination of n and T in the solar chromosphere in the height range
from -120 km to 6000 km: (1) The intensity of the continuous emission
at X 4700 indicates that T, increases with height from about 4800 at -
65 km. (2) The emission, per cubic centimeter, in the Balmer continuum
attains a maximum near 500 km, which indicates that here the free
electrons begin to come mainly from H rather than from metals, and thus
places the limits: 5000 < T < 7000 , 4 X 1011 <n < S X 1011
at this height. (3) The intensities of the continuum at X 4700 and X
3640 require values of T as follows: 5000 at 500 km, 6100 at 1000 km,
and 6700 at 3000 kin. In the interval 1()()( 3000 kin the ionization
of H increases from about 3 to about 80 per cent. (4) Above 3000 kin
no data on the Balmer free-bound continuum exist, and an extension
of the results of 3 to greater heights requires the use of the height
gradient of the Balmer lines to replace that of the continuum. Such a
technique fixes T only within certain limits, which, at 6000 km, are:
2 X 10 < T < 1.2 X 10 . The chief uncertainty of the analysis
lies in the use of the assumption of a continuous distribution of
material in the atmosphere. The results of the analysis suggest the
validity of such assumption below about 2500 kin, and its breakdown
above about 3000 km. An estimate of optical depth in the continuum,
from the present analysis, at a height of 500 km produces a value
agreeing well with an estimate based on the analysis of the lines.
---------------------------------------------------------
Title: Solar Corpuscles Responsible for Geomagnetic Disturbances
Authors: Pecker, Jean-Claude; Roberts, Walter Orr
1955JGR....60...33P Altcode:
A qualitative hypothesis is given that attributes recurrent "M-region"
geomagnetic disturbances to the arrival at the earth of solar
corpuscles that have been gathered into beams by the deflecting action
of coronal-region fields, presumably magnetic, associated with centers
of heightened solar activity. The hypothesis identifies the source of
solar corpuscles that produces M-region magnetic disturbances with
"quiet areas" of the solar surface. A related hypothesis associates
non-recurrent magnetic storms, the greatest ones, with a different
solar corpuscular source, found in the active region itself.
---------------------------------------------------------
Title: CN Bands in the Chromosphere.
Authors: Pecker, J. -C.; Athay, R. G.
1955ApJ...121..391P Altcode:
CN bands are observed in emission in the chromosphere between the
photospheric limb and a height of 750 km. Spectrograms obtained by
the High Altitude Observatory at the Khartoum eclipse in 1952 showed a
scale height of 210 km for the intensity of the emission in the 2 2 (0,
0) band at X 3883. The emission spectrum at 100 km gives a rotation
temperature of 4500 , and the photospheric absorption spectrum in
the Utrecht Atlas gives a rotation temperature of 4000 . At eclipse
heights other than 100 km, the data were used to determine the
temperature gradient. The rotation temperature was found to increase
with height. Photospheric and chromospheric models were used to predict
the absolute intensity of the CN emission in this band. The predicted
intensity was less than the observed intensity by a tactor of 20. The
discrepancy was accounted for by uncertainties in the absorption
coefficient, which was obtained from a study of the absorption profile
in the Utrecht Atlas.
---------------------------------------------------------
Title: Le rôle des raies formées par diffusion dans l'effet de
<< blanketing >>
Authors: Pecker, Jean Claude
1955AnAp...18..145P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Prominence of July 25, 1951.
Authors: Rothschild, Kurt; Pecker, Jean-Claude; Roberts, Walter Orr
1955ApJ...121..224R Altcode:
The motions of 49 knots in the large prominence of July 25, 1951, have
been measured. For 17 of them, a definite variation of acceleration
vectors has been found. The dynamics of the motion still remains
obscure. It seems difficult to represent them by a coherent field of
forces. Moreover, gravity seems to play no role in this prominence.
---------------------------------------------------------
Title: Sur le rayonnement des Céphéides
Authors: Canavaggia, R.; Pecker, J. C.
1955AnAp...18..151C Altcode:
No abstract at ADS
---------------------------------------------------------
Title: A model of the chromosphere from 1952 eclipse data.
Authors: Athay, R. G.; Pecker, J. C.; Thomas, R. N.; Menzel, D. H.
1954AJ.....59..314A Altcode:
An analysis of the Balmer free-bound emission at X3640 and the continuum
intensities at ~4700 was carried out using data from the slitless
spectrograms obtained by the High Altitude Observatory at Khartoum,
Sudan. The data gave intensities at X3640 and ~4700 at intervals
of approximately 100 km between 0 and 2400 km above the limb and
intensities at X4700 at many additional heights between 2400 and 48,000
km. The Balmer line data, which extended from 100 to 6400 km, was used
to supplement the free- bound data for heights between 2400 and 6000
km. Values of electron density, Ne, and kinetic temperature, Te, were
determined at heights between 0 and 6000 km. The analysis was based on
the assumption of a homogeneous chromosphere, with Ne and Te depending
upon height only. The continuum at X4700 was assumed to come from H-
emission and electron scattering of photospheric light. The results of
the analysis of the continuum data gave a chromospheric model that could
be divided into three distinct regions with the following properties:
Region I (o to 500 km). In this region Te increases from 50000K at the
photospheric limb (tangential optical depth I, radial optical depth
0.005) to 600&K at 500 km. Hydrogen begins to ionize near the top
of this region with NpHNe. This result is consistent with a marked
increase with height of the quantity NeNpTJ in the region near 500 km,
which was inferred from the Balmer free-bound and line emission. Thus
it appears that the "boundary temperature," T,nin~42000K, occurs below
a radial optical depth of 0.005. Region 2 (1000 to 3500 km). The
ionization of hydrogen increases from 5 per cent at the base to 99
per cent at the top of this region. Te increases slowly from 60000K
to > 70000 K. The low gradient of Te suggests that the external
energy supply suffices only for the ionization. Region 3 (~3500 km
up). Further ionization of hydrogen is negligible and a large rise in Te
occurs. The free-bound emission is too weak to measure in this region
and an accurate evaluation of Te is difficult. An extrapolation of the
free- bound intensities to 6000 km based on the ob- served intensities
of the Balmer lines between 2400 and 6400 km gives Te 7 X io40K. The
analysis allowed an accurate determination of Te in the region ~1500
km, and the probable errors in the data plus the errors introduced in
the analytical procedures were not likely to cause errors of more than
~3000 in Te. However, in higher regions the values of Te were quite
sensitive to the analytical procedures at~d errors of a factor 2 in Te
are possible. The eclipse spectrograms at heights above 5500 km show Ha,
and all other strong chromospheric lines that persist to these heights,
as irregular beaded structures. This irregular structure is presumably
due to spicule activity at these heights and requires the consideration
of a non-uniform chromospheric model, at least in the upper levels of
the chromosphere. A study of the Fe xi line at X7892 on the eclipse
spectrograms showed that there was strong emission in this line at
heights well below 10,000 km and suggested that the emission started
in the regions where the chromospheric lines break up into a spicule
structure. The work reported in this paper was supported by the Office
of Naval Research and carried out in close cooperation with the Naval
Research Laboratory. High A ititude Observatory, Boulder, Colo. and
Harvard College Observatory, Cambridge, Mass.
---------------------------------------------------------
Title: Solar corpuscles responsible for geomagnetic disturbances.
Authors: Pecker, Jean-Claude; Roberts, Walter Orr
1954AJ.....59..330P Altcode:
Some years ago C. W. Allen presented all extensive analysis of
geomagnetic storms, and offered suggestions for their explanation
in terms of streams of corpuscles originating in the sun.' We offer
a qualitative hypothesis, that incorporates Allen's suggestions and
identifies the solar source of corpuscular emission responsible both for
recurrent and non-recurrent geomagnetic disturbances. We postulate two
different types of solar sources of such particles as follows: (a) Small
jets of corpuscles, distributed in a fine network all over the surface
of the sun, and presumably associated with chromospheric spicules
or photospheric granules. These jets, in the absence of deflecting
solar magnetic fields, would send radial streams of corpuscles in all
directions; the streams would be present at all times, regardless of
the state of solar activity. In the presence of deflecting magnetic
fields from active centers, and the general magnetic field of the sun,
the corpuscles are deflected to form the streams responsible for the
recurrent "M-region" geomagnetic disturbances. (b) Irregular streams
of ions associated with active regions, and probably most intense at
the time of solar flares. Not all active centers have such streams
present at all times, and there is probably also a large dispersion of
particle velocities and stream energies for this type of corpuscular
stream. We present evidence from a study of geomagnetic disturbances
in 1952-53 to support the hypothesis of the formation of recurrent
magnetic storms by particle streams of the first type. In particular
we find evidence that above certain active regions there is a "cone of
avoidance" with low particle density. The center of the cone reaches
earth three days later. We also show that there is some evidence that
at the edges of the cone-of-avoidance the deficiency of corpuscles is
compensated by regions with an excess particle density. The hypothesis
is in accord with the explanation we gave earlier for the formation
of the K component of the white light corona,' here associated with
the solar-terrestrial corpuscular beams. The hypothesis suggests that
daily coronagraphic observation of the white light corona may prove of
great value for prediction of the times of occurrence of geomagnetic
storms and associated phenomena. This work was supported by the Air
Force Cambridge Research Center, Geophysical Research Directorate, Air
Research and Development Command. 5.M. N. 104, 53, 5944. 2.Roberts,
W. 0., R. Grenchik, and D. E. Billings, A. f. 58, 225, 5953. High
Altitude Observatory, Boulder, Colo.
---------------------------------------------------------
Title: L'Astronomie Au Jour le Jour
Authors: Couderc, Paul; Pecker, Jean-Claude; Schatzman, Evry
1954ajj..book.....C Altcode:
No abstract at ADS
---------------------------------------------------------
Title: I Observations photométriques et polarimétriques de la
Couronne externe
Authors: Michard, R.; Dollfus, A.; Pecker, J. C.; Laffineur, M.;
D'Azambuja, M.
1954AnAp...17..320M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: III Observations radioélectriques de la Couronne
Authors: Laffineur, M.; Michard, R.; Pecker, J. C.; Vauquois, B.
1954AnAp...17..358L Altcode:
No abstract at ADS
---------------------------------------------------------
Title: II Photographies monochromatiques de la Couronne
Authors: Michard, R.; Dollfus, A.; Pecker, J. C.; Laffineur, M.;
D'Azambuja, M.
1954AnAp...17..345M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Observations optiques et radioélectriques de l'éclipse
totale de Soleil du 25 février 1952
Authors: Laffineur, M.; Michard, R.; Pecker, J. C.; Dollfus, A.;
Vauquois, B.; D'Azambuja, M.
1954AnAp...17..317L Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Le rôle du gradient de température dans la détermination
des abondances
Authors: Pecker, J. C.
1954LIACo...5..449P Altcode: 1954pna..conf..449P; 1954MSRSL...1..449P
No abstract at ADS
---------------------------------------------------------
Title: L'exploitation des spectres stellaires
Authors: Pecker, J. C.
1953LAstr..67..117P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Les Géantes Jaunes. II. Spectres continus
Authors: Canavaggia, Renée; Pecker, Jean-Claude
1953AnAp...16...47C Altcode:
No abstract at ADS
---------------------------------------------------------
Title: La mesure de la largeur équivalente d'une raie
spectrale. L'influence du pouvoir de résolution
Authors: Pecker, Jean-Claude; van Regemorter, Henri
1952AnAp...15..363P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Les géantes jaunes. I. Modèles d'atmosphères
Authors: Canavaggia, Renée; Pecker, Jean-Claude
1952AnAp...15..260C Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Un phénomène d'Optique atmosphérique : Mirages sur l'Océan
Authors: Pecker, J. C.
1951LAstr..65..383P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Les atmosphères stellaires
Authors: Pecker, J. C.
1951LAstr..65...57P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Interprétation des Mesures de Vitesses Radiales dans les
Granules Solaires
Authors: de Jager, C.; Pecker, J. C.
1951CRASB.232.1645D Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Contribution à la théorie du type spectral: IV. La formation
des raies dans les spectres stellaires
Authors: Pecker, Jean-Claude
1951AnAp...14..115P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Le calcul des fortes raies d'absorption dans les spectres
stellaires
Authors: Pecker, Jean-Claude
1951AnAp...14..383P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Contribution à la théorie du type spectral: V. Le <<
blanketing effect >> et la structure de la photosphère solaire
Authors: Pecker, Jean-Claude
1951AnAp...14..152P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Contribution à la théorie du type spectral. III. Construction
de modèles d'étoile B
Authors: Pecker, Jean-Claude
1950AnAp...13..433P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Contribution à la théorie du type spectral: II. La
polarisation par les électrons libres et le type spectral
Authors: Pecker, Jean-Claude
1950AnAp...13..319P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Contribution à la théorie du type spectral: I. Introduction
générale, La construction des modèles d'atmosphère
Authors: Pecker, Jean-Claude
1950AnAp...13..294P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Les Atmosphere Stellaires
Authors: Pecker, Jean-Claude
1950LAstr..64..471P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Contribution à la théorie du type spectral Title:
Contribution à la théorie du type spectral
---------------------------------------------------------
Title: Contribution to
the theory of spectral class;
Authors: Pecker, Jean-Claude
1950PhDT........20P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The theoretical intensities of faint Fraunhofer lines (third
paper). Weighting functions for different points of the solar disk
Authors: Pecker, J. C.
1949BAN....11...43P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Variations des raies de CH sur le disque solaire
Authors: Pecker, Jean-Claude
1949AnAp...12....9P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Variations de certaines raies de Swan du carbone du centre
au bord du disque solaire
Authors: Pecker, Charlotte; Pecker, Jean-Claude
1949AnAp...12..197P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Sur la répartition des bandes de CN et CH sur le disque
solaire
Authors: Pecker, Jean-Claude; Peyturaux, Roger
1948AnAp...11...90P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: La composition chimique des étoiles (Hydrogène, Hélium)
Authors: Pecker, Jean-Claude; Schaztman, Evry
1947AnAp...10..181P Altcode:
No abstract at ADS
