Author name code: redman ADS astronomy entries on 2022-09-14 author:"Redman, Roderick Oliver" year:1910-1977 ------------------------------------------------------------------------ Title: Mass transfer in the symbiotic binary AG Pegasi. Authors: Hutchings, J. B.; Cowley, A. P.; Redman, R. O. Bibcode: 1975ApJ...201..404H Altcode: Line profiles, equivalent widths, and radial velocities have been derived from high-dispersion spectra of the symbiotic star AG Peg. The model suggested from recent spectra is a hot, approximately 1 M0 subluminous star orbiting a 3 M0 giant. The hot object rotates rapidly and ejects material which streams toward the cool primary. A bright region near the substellar point on the M star is responsible for a 0.3 mag light variation, and is heated either by radiation from the hot star or by collisions from the impinging stream. It is found that the size of the emission nebula surrounding the hot object has decreased, while its excitation has increased, since Merrill's observations several decades ago. At the same time, the stream density appears to have increased. An expanding, low-density envelope surrounds the system. The exact orbital period remains uncertain because of complications in the interpretation of the velocities from several regions, but a value of 820d is adopted. The system is thought to be in a late stage of its evolution, but it is not clear what forces (perhaps magnetic?) drive the stream, since the stars are well separated. Subject headings: binaries - combination spectra - mass loss - stars, individual Title: Binary O star HR 8281. Authors: Crampton, D.; Redman, R. O. Bibcode: 1975AJ.....80..454C Altcode: No abstract at ADS Title: Spectroscopic investigation of X Persei (= 2U 0352+30?). Authors: Hutchings, J. B.; Crampton, D.; Redman, R. O. Bibcode: 1975MNRAS.170..313H Altcode: Radial velocity and line intensity measurements are reported from recent high dispersion spectrograms of X Persei. The binary interpretation of the previously reported s8o-day periodicity is discussed and revised orbital para1neters are presented. Line intensity changes occur but are not found to be correlated with this cycle. Rapid line profile changes have been observed with an Image Isocon camera. The emission line profiles are discussed in terms of binary model. Title: Evidence for the Existence of a Massive Companion to X Persei (=2U 0352+30?) Authors: Hutchings, J. B.; Cowley, A. P.; Cramption, D.; Redman, R. O. Bibcode: 1974ApJ...191L.101H Altcode: Radial-velocity measurements of X Persei of spectra obtained from 1920 to 1974 reveal a probable periodicity of about 584 days. The broad Balmer absorption lines and the emission peaks move in antiphase and suggest the existence of a companion of mass at least 30 M0. Si bjert headings: Be stars - binaries - massive stars - X-ray sources Title: The Galactic Distribution of H II Regions. Authors: Crampton, D.; Redman, R. O. Bibcode: 1974BAAS....6..345C Altcode: No abstract at ADS Title: Cambridge Observatories. Report for the year ending 1972 September 30. Authors: Redman, R. O. Bibcode: 1973QJRAS..14..199R Altcode: No abstract at ADS Title: HD 173219. A periodic Be star. Authors: Hutchings, J. B.; Redman, R. O. Bibcode: 1973MNRAS.163..219H Altcode: Spectroscopic observations at high dispersion are reported which reveal a period of days in the large velocity variations of this star. Velocity amplitudes derived from different lines vary widely, but the other orbital elements agree well. The spectrum has numerous peculiarities, some of which appear to change with phase. The main features suggest a spectral type of B2 Ib. Possible shell configurations are discussed and it is speculated that the invisible high mass companion may be a black hole. Title: HD 187399: a binary with case B mass-exchange? Authors: Hutchings, J. B.; Redman, R. O. Bibcode: 1973MNRAS.163..209H Altcode: Recent coude' spectroscopy of HD 187399 is reported and the orbital elements of the single-lined binary redetermined. It is suggested that the primary fills its Roche lobe and loses mass at periastron, and that the system corresponds to a case B of mass-exchange. The secondary appears to be more massive and observationally undetectable. The possibility of its being a black hole is discussed. Title: Cambridge Observatories. Report for the year ending 1971 September 30. Authors: Redman, R. O. Bibcode: 1972QJRAS..13..436R Altcode: No abstract at ADS Title: Pec Authors: Redman, R. O. Bibcode: 1971QJRAS..12...39R Altcode: No abstract at ADS Title: Cambridge Observatories. Report for the year ending 1970 September 30. Authors: Redman, R. O. Bibcode: 1971QJRAS..12...76R Altcode: No abstract at ADS Title: University of Cambridge. Report of the Observatories Syndicate for the year ending 1970 September 30. Authors: Redman, R. O. Bibcode: 1971ucro.book.....R Altcode: No abstract at ADS Title: Cambridge Observatories. Report for the year ending 1969 September 30. Authors: Redman, R. O. Bibcode: 1970QJRAS..11..255R Altcode: No abstract at ADS Title: University of Cambridge. Report of the Observatories Syndicate for the year ending 1969 September 30. Authors: Redman, R. O. Bibcode: 1970ucro.book.....R Altcode: No abstract at ADS Title: Cambridge Observatories. Report for the year ending 1968 September 30. Authors: Redman, R. O. Bibcode: 1969QJRAS..10..134R Altcode: No abstract at ADS Title: Coma tolerances for photographic star images Authors: Linfoot, E. H.; Redman, R. O. Bibcode: 1968MNRAS.139..347L Altcode: The question of alignment tolerances in large Cassegrain-type telescopes led us to consider the problem: how much coma can be tolerated in photographic star images intended for high-accuracy positional astronomy? In the present paper this problem is attacked computationally for a 150-in. Ritchey-Chretien telescope with a 50-in. secondary mirror. A star image, distorted by coma, possible focus error and astigmatism, blurred by seeing spread, and superposed on a uniform sky background, is received on a model photographic emulsion of specified characteristic curve. The mean centres of the resulting density and blackness distributions each vary with the star magnitude; their variations are taken as an estimate of the' astrometric magnitude errors If the tolerance for these errors is set at arc sec it appears that a geometrical coma tolerance of arc sec is a reasonable value for a large Ritchey- telescope. In general, the `magnitude errors' diminish when the seeing deteriorates (though random errors of measurement would then increase); they are increased by a slight focusing error and also by a decrease in the total scale of the emulsion, such as is generally associated with increasing contrast ,`. Of particular interest is the conclusion that the alignment tolerances for photographic astrometry are probably less stringent than those for visual double star measurement. Title: Narrow-Band Photometry at the Cambridge Observatories Authors: Redman, R. O. Bibcode: 1966IAUS...24..155R Altcode: No abstract at ADS Title: Coma Authors: Redman, R. O. Bibcode: 1966IAUS...27...91R Altcode: No abstract at ADS Title: Discussion on the Quiet Chromosphere Authors: Redman, R. O. Bibcode: 1965ASSL....1..206R Altcode: 1965sosp.conf..206R No abstract at ADS Title: A Conservative View of the Planets Authors: Redman, R. O. Bibcode: 1962Natur.194...48R Altcode: No abstract at ADS Title: The Natural History of Galaxies Authors: Redman, R. O. Bibcode: 1961Natur.192..838R Altcode: No abstract at ADS Title: Photometry in Astronomy Authors: Redman, R. O. Bibcode: 1961QJRAS...2...96R Altcode: 1961QJRAS...2...96. No abstract at ADS Title: Professor F. J. M. Stratton, F.R.S. Authors: Redman, R. O. Bibcode: 1961JRASC..55....9R Altcode: No abstract at ADS Title: General Astrophysics Authors: Redman, R. O. Bibcode: 1960Natur.188..348R Altcode: No abstract at ADS Title: The Work of the Cambridge Observatories Authors: Redman, R. O. Bibcode: 1960QJRAS...1...10R Altcode: 1960QJRAS...1...10. No abstract at ADS Title: Stellar Populations Authors: Redman, R. O. Bibcode: 1960Natur.185..412R Altcode: No abstract at ADS Title: Meeting of 1960 January 8 Authors: Redman, R. O. Bibcode: 1960MNRAS.120....1R Altcode: No abstract at ADS Title: Photoelectric measurements of the λ4200 A CN band and the G band in G8-K5 spectra Authors: Griffin, R. F.; Redman, R. O. Bibcode: 1960MNRAS.120..287G Altcode: A description is given of a rapid method of using a spectrometer to give reproducible photoelectric measures of integrated intensities over significant features of stellar spectra, without the necessity for a sky of photometric quality. The accuracy achieved is I per cent. The A4200 A CN band has been measured in 712 late-type stars and the G band in 212 of these. Absolute magnitudes derived from CN intensities have mean errors of at least 1m .5. There is only a weak correlation of weak CN with high space velocity. "Weak-line" stars have no anomaly in their CN absorption; "strong-line" stars have slightly enhanced CN. For G to Ki stars the spectral type deduced from G band intensities has a mean deviation of 0 15 class from the MK type. There is a small absolute magnitude effect, the G band strengthening with intrinsic luminosity. High-velocity stars have completely normal G band intensities. "Weakline" stars show the G band very slightly stronger," strong-line" stars show it slightly weaker than the mean, but the individual scatter is fairly large and the difference between the two groups is scarcely significant statistically. Title: Dust and gas between the Earth and the Sun Authors: Redman, R. O. Bibcode: 1959Obs....79..172R Altcode: No abstract at ADS Title: Russian Astrophysics Authors: Redman, R. O. Bibcode: 1958Natur.182..548R Altcode: No abstract at ADS Title: International Astronomy Authors: Redman, R. O. Bibcode: 1957Natur.180..824R Altcode: No abstract at ADS Title: Planetary Nebulae Authors: Redman, R. O. Bibcode: 1956Natur.178.1315R Altcode: No abstract at ADS Title: International Co-Ordination of Galactic Research Authors: Redman, R. O. Bibcode: 1955Natur.176..847R Altcode: No abstract at ADS Title: International Astronomical Union: General Assembly in Dublin Authors: Redman, R. O. Bibcode: 1955Natur.176..626R Altcode: No abstract at ADS Title: British Astronomers at the Total Solar Eclipse of June 20 Authors: Redman, R. O. Bibcode: 1955Natur.175.1018R Altcode: No abstract at ADS Title: The widths of narrow lines in the spectrum of the low chromosphere, measured at the total eclipse of February 25, 1952 Authors: Redman, R. O. Bibcode: 1955VA......1..713R Altcode: The spectrum of the chromosphere was photographed at the total solar eclipse of 25th February, 1952, with a slit spectrograph, using the second order of a 6-in. Rowland concave grating. Line widths were measured in both ultra-violet and yellow. Both regions show ξ 0 near 2·5 km per sec. for heavy elements in the lowest chromosphere (average line of sight velocity about 1·8 km per sec.), in close agreement with measures made at the 1940 eclipse. There is some evidence for a small increase of velocity with height. Title: Photographic and photovisual magnitudes of 7m—10m stars in the +15° Selected Areas. Authors: Beer, A.; Redman, R. O.; Yates, G. G. Bibcode: 1955MmRAS..67....1B Altcode: No abstract at ADS Title: Total Solar Eclipse of June 30: British Expeditions' Results Authors: Redman, R. O. Bibcode: 1954Natur.174..247R Altcode: No abstract at ADS Title: Photographic and photovisual magnitudes of 7m-10m stars in the + 15° Selected Areas Authors: Beer, A.; Redman, R. O.; Yates, G. G. Bibcode: 1954MNRAS.114..271B Altcode: In order to provide a closer link between star magnitudes in the northern and southern skies, pg and pv magnitudes of 1268 stars in the twenty-four Selected Areas at Q 15 have been determined on the international magnitude system of the NPS. The first part of the programme was carried out by in-focus photography, using the Cape photometric cameras, following approximately the same procedure as that used at the Cape. The standard stars were taken from the Seares, Ross, Joyner (SRJ) catalogue. Stars in nine of the Selected Areas were also measured photoelectrically, using a pulse- counting photometer, again with comparison stars near the Pole. In addition 135 SRJ stars were measured photoelectrically to verify the relation of SRJ magnitudes to the NPS, while all NPS stars brighter than IO'n.7 pv were measured photoelectrically, to examine their self-consistency of scale. After taking into account the scale and colour errors of SRJ, the inter- agreement between photographic and photoelectric measures at ¾ 150 is satisfactory. For nine Areas together the mean zero difference (photoelectric minus photographic) is ¾om.007+ on' oio pg, and y0m.019+ 0m.007 pv. Use of a comparatively short series of measures made earlier at the Cape has allowed a provisional comparison with the S magnitude system, the present basis of stellar photometry at the Cape. With single photoelectric readings in the order standard star S, field star F, standard star S, sky", the standard error of the field magnitude is 0m o6 pg, 0m.045 pv. The standard error of one photographic measure of an individual star, based on four exposures in the order SFFS, is o .o6 pg, 011' o6 pv, provided the plate zero error is known independently from photoelectric measures. If there is no such information with regard to zero error, the standard error for one star measured photographically on one plate only is om.o8 pg and o11' o8 pv. There is good evidence that in England the errors of stellar photometry are determined chiefly by the sky, and depend heavily on the stringency with which observing nights are selected. The standard error of one catalogue magnitude varies, according to Area, over the ranges 011' o3oo o45 pg, o11' ' 045 pv. The paper concludes with a few comparisons with other catalogues and a short examination of the relation between spectral types and colour indices. Title: Temperature and turbulence in the chromosphere Authors: Redman, R. O.; Suemoto, Z. Bibcode: 1954MNRAS.114..524R Altcode: Measures of chromospheric line profiles in high resolution spectrograms obtained at the total solar eclipse of 1952 February 25 have been used to investigate further the question of temperature and turbulence in the solar chromosphere. In trying to deduce a distribution of line-of-sight velocities, arising from either temperature motions or turbulence, two problems are encountered : (a) to estimate the chromospheric heights to which the spectra refer, and (b) to correct the measures for broadening by self-absorption and Stark effect. Heights have been estimated partly from a comparison of line intensity ratios with those measured by Dr J. Houtgast on slitless spectrograms obtained at the same eclipse, and partly from the time of exposures, using the motion of the Moon relative to the Sun. Broadening by self- absorption has been estimated in the case of metallic lines by an empirical method. The corrected line widths, together with others of He 1, suggest an approximately linear increase of line-of-sight velocity with height, from km/sec at tbe base of the chromosphere, to 16 km/sec at height 2600 km. Taking into account the uncertainty in effective height, these results agree with those obtained in 1940. The hydrogen Balmer lines have been examined in more detail. The earlier members of the series are broadened by self-absorption, while later members are broadened by Stark effect. Both kinds of broadening were first estimated by an empirical method, which led to the conclusion that the temperature of the lower chromosphere does not exceed 10 000 deg. K. The hydrogen line widths were then computed more elaborately by a theoretical method, which showed that the observations could be fitted almost as well by a temperature 6 ooo deg. as by 10 000 deg. It seems unlikely that the present data will yield any closer estimate of temperature than this. Title: The flash spectrum without eclipse Authors: Redman, R. O. Bibcode: 1953Obs....73..242R Altcode: No abstract at ADS Title: Report of proceedings of Cambridge Observatories Authors: Redman, R. O. Bibcode: 1952MNRAS.112..295. Altcode: 1952MNRAS.112..295R No abstract at ADS Title: The continuous spectrum of a prominence observed at the total solar eclipse of 1952 February 25. Authors: Zanstra, H.; Redman, R. O. Bibcode: 1952PRNAA..55..598Z Altcode: 1952RNAAS..55..598Z No abstract at ADS Title: Stellar Energy and Evolution Authors: Redman, R. O. Bibcode: 1951Natur.167..743R Altcode: No abstract at ADS Title: Reply to Evans Authors: Redman, R. O. Bibcode: 1951Obs....71...76R Altcode: No abstract at ADS Title: Planetary Atmospheres Authors: Redman, R. O. Bibcode: 1950Natur.165..987R Altcode: No abstract at ADS Title: Solar Physics for the Layman Authors: Redman, R. O. Bibcode: 1950Natur.165..741R Altcode: No abstract at ADS Title: Determination of Stellar Magnitudes by in-focus Photographic Photometry Authors: Menzies, A.; Redman, R. O.; Stoy, R. H. Bibcode: 1949MNRAS.109..647M Altcode: No abstract at ADS Title: The observational problem of stellar magnitudes and colours Authors: Stoy, R. H.; Redman, R. O. Bibcode: 1946Obs....66..330S Altcode: No abstract at ADS Title: Post-war astronomy Authors: Redman, R. O. Bibcode: 1945Obs....66..153R Altcode: No abstract at ADS Title: The Fabry method of stellar photometry Authors: Redman, R. O. Bibcode: 1945MNRAS.105..212R Altcode: No abstract at ADS Title: Sir Arthur Eddington, O. M. (Obituary) Authors: Redman, R. O. Bibcode: 1945MNSSA...4...26R Altcode: No abstract at ADS Title: Fifty years of progress in astronomy Authors: Redman, R. O. Bibcode: 1944Obs....65..213R Altcode: No abstract at ADS Title: The roughness of the Sun's surface Authors: Redman, R. O. Bibcode: 1944Obs....65..147R Altcode: No abstract at ADS Title: Some problems of the puter layers of the Sun (Council report on the progress of astronomy) Authors: Redman, R. O. Bibcode: 1944MNRAS.104...99R Altcode: No abstract at ADS Title: Fifty Years of Progress in Astronomy Authors: Redman, R. O. Bibcode: 1944MNSSA...3...33R Altcode: No abstract at ADS Title: An Astronomical Institute for South Africa? Authors: Redman, R. O. Bibcode: 1944MNSSA...3...46R Altcode: No abstract at ADS Title: Spectrographic observations at the total solar eclipse of 1940 October 1 III. The spectrum of the extreme limb of the Sun Authors: Redman, R. O. Bibcode: 1943MNRAS.103..173R Altcode: No abstract at ADS Title: Note on a further search for polarization in Fraunhofer lines Authors: Redman, R. O. Bibcode: 1943MNRAS.103..329R Altcode: No abstract at ADS Title: The Possibility of Making Astronomical Observations from Aircraft Authors: Redman, R. O. Bibcode: 1943MNSSA...2...96R Altcode: No abstract at ADS Title: Obituary: J. S. Plaskett Authors: Redman, R. O. Bibcode: 1942Obs....64..207R Altcode: No abstract at ADS Title: Spectrographic observations at the total solar eclipse of 1940 October 1. I. Instrument and observational procedure Authors: Redman, R. O. Bibcode: 1942MNRAS.102..134R Altcode: No abstract at ADS Title: Spectrographic observations at the total solar eclipse of 1940 October 1. II. Concerning the flash spectrum and automic velocities in the chromosphere Authors: Redman, R. O. Bibcode: 1942MNRAS.102..140R Altcode: No abstract at ADS Title: Observational search for polarisation in the calcium line λ 4227 A. near the Sun's limb Authors: Redman, R. O. Bibcode: 1941MNRAS.101..266R Altcode: No abstract at ADS Title: Spectrographic observations at the total solar eclipse of 1940 October 1 Authors: Redman, R. O. Bibcode: 1940Obs....63..307R Altcode: No abstract at ADS Title: A new projection micrometer machine for stellar spectrograms Authors: Redman, R. O. Bibcode: 1939MNRAS..99..686R Altcode: No abstract at ADS Title: Extra-galactic nebulae: their nuclei and their inclinations to the line of sight Authors: Redman, R. O. Bibcode: 1938Obs....61..216R Altcode: No abstract at ADS Title: Photographic photometry of the elliptical nebulæ (Second paper) Authors: Redman, R. O.; Shirley, E. G. Bibcode: 1938MNRAS..98..613R Altcode: No abstract at ADS Title: Line profiles (Council report on the progress of astronomy) Authors: Redman, R. O. Bibcode: 1938MNRAS..98..311R Altcode: No abstract at ADS Title: The cores of certain Fraunhofer lines Authors: Redman, R. O. Bibcode: 1937MNRAS..97..552R Altcode: No abstract at ADS Title: The construction and performance of a spectrograph for studying the solar chromosphere Authors: Redman, R. O. Bibcode: 1937MNRAS..97..668R Altcode: No abstract at ADS Title: Photometry of the Andromeda nebula, M 31' Authors: Redman, R. O.; Shirley, E. G. Bibcode: 1937MNRAS..97..416R Altcode: No abstract at ADS Title: Centre to limb variation of line intensity Authors: Redman, R. O. Bibcode: 1936Obs....59..287R Altcode: No abstract at ADS Title: Photometry, Photographic, of the elliptical nebulae Authors: Redman, R. O. Bibcode: 1936MNRAS..96..588R Altcode: No abstract at ADS Title: Centre to limb variation in Fraunhofer line intensity over the disc of the primary star of U Cephei and of U sagitt&aelig Authors: Redman, R. O. Bibcode: 1936MNRAS..96..488R Altcode: No abstract at ADS Title: A determination of the profile of the calcium line λ4227 in the solar spectrum, using a prism spectrograph and monochromator Authors: Redman, R. O. Bibcode: 1935MNRAS..95..742R Altcode: No abstract at ADS Title: Two points arising in spectrophotometric work Authors: Redman, R. O. Bibcode: 1935Obs....58..126R Altcode: No abstract at ADS Title: Note on a monochromator for use in determining Fraunhofer line profiles Authors: Redman, R. O. Bibcode: 1935MNRAS..95..290R Altcode: No abstract at ADS Title: Stellar Radial Velocities Authors: Redman, R. O. Bibcode: 1932Natur.130..836R Altcode: No abstract at ADS Title: The galactic rotation effect in late type stars (second paper) Authors: Redman, R. O. Bibcode: 1931MNRAS..92..107R Altcode: No abstract at ADS Title: Note on three variable stars : (i) SV Ursæ Majoris, (ii) V Ursæ Majoris, (iii) WY Geminorum Authors: Redman, R. O. Bibcode: 1931MNRAS..92..116R Altcode: No abstract at ADS Title: Y Cygni Authors: Redman, R. O. Bibcode: 1931Obs....54..195R Altcode: No abstract at ADS Title: The Galactic Rotation Effect in Some Late Type Stars Authors: Redman, R. O. Bibcode: 1931PDAO....4..325R Altcode: No abstract at ADS Title: Y Cygni Authors: Redman, R. O. Bibcode: 1931PDAO....4..341R Altcode: No abstract at ADS Title: The galactic rotation effect in some late type stars, II. Authors: Redman, R. O. Bibcode: 1931PDAO....6...27R Altcode: No abstract at ADS Title: Y Cygni. Authors: Redman, R. O. Bibcode: 1930PASP...42..250R Altcode: No abstract at ADS Title: Y Cygni. Some spectroscopic results Authors: Redman, R. O. Bibcode: 1930MNRAS..90..754R Altcode: No abstract at ADS Title: The galactic rotation effect in late-type stars Authors: Redman, R. O. Bibcode: 1930MNRAS..90..690R Altcode: No abstract at ADS Title: The galactic rotation effect in some late- type stars. Authors: Redman, R. O. Bibcode: 1930PDAO....4..325R Altcode: No abstract at ADS Title: Y Cygni. Authors: Redman, R. O. Bibcode: 1930PDAO....4..341R Altcode: No abstract at ADS Title: An investigation into the parallaxes, absolute magnitudes and motions of certain stars Authors: Redman, Roderick Oliver Bibcode: 1930PhDT.........5R Altcode: No abstract at ADS Title: Seminar Talk (Semi-regular Variables) Authors: Redman, R. O. Bibcode: 1930JRASC..24...38R Altcode: No abstract at ADS Title: A determination from binary star data of the giant and dwarf branches of the Russell diagram Authors: Redman, R. O. Bibcode: 1928MNRAS..88..718R Altcode: No abstract at ADS Title: A statistical study of the effect of the mass-luminosity relation on the hypothetical parallaxes of binary stars Authors: Redman, R. O. Bibcode: 1927MNRAS..88...33R Altcode: No abstract at ADS