Author name code: schneeberger ADS astronomy entries on 2022-09-14 author:"Schneeberger, Timothy J." ------------------------------------------------------------------------ Title: Limits on line-of-site jitter derived from image resolution requirements Authors: Schneeberger, Timothy J. Bibcode: 1994SPIE.2221..704S Altcode: Requirements for image resolution can be used to set upper limits on the allowable line-of-site (LOS) motion of an acquisition, tracking, and pointing (ATP) system. Image resolution is important for image-based tracking algorithms and for typical ancillary requirements for target phenomenology data gathering. During the system design phase of an ATP platform, base-motion- disturbance details such as total rms power and spectral distribution of this power may not be known for primary disturbance sources such a gimbals, cooling systems, and steering mirrors. In this case, setting upper limits to allowable LOS jitter is an important criteria in the trade study analyses for these components. The effect of jitter is frequency dependent and can be partitioned into regimes based on the image sample rate of the system. The application of image-resolution requirements for the High Altitude Balloon Experiment are used to set allowable LOS motion for random, sinusoidal, and linear disturbances. Three frequency regimes are identified with different allowable-motion amplitudes. This top-level systems methodology can be applied to many imaging applications such as estimating the blur induced by wind loading of ground based telescopes. Title: Image Recovery and Pattern Recognition Applications in a Visual Language Environment Authors: Schneeberger, Timothy; Pierson, Robert; Dayton, Dave; Gonglewski, John D. Bibcode: 1992ASPC...25..140S Altcode: 1992adass...1..140S Khoros is a software system which implements a visual programming language. It uses graphical icons and pipeline data flow to simplify the development and testing of new signal and image processing algorithms. We briefly describe two different applications developed under Khoros: one in pattern recognition, the other in astronomical imaging. Title: Integrated image processing and tracker performance prediction workstation Authors: Schneeberger, Timothy J.; McIntire, Harold D. Bibcode: 1991SPIE.1567....2S Altcode: Extensive research has shown that including target aspect angle measurements from an optical sensor can significantly improve the performance of radar tracking systems. Integrating sequences of target imagery with the kinematic information involves sets of image processing and sensor data fusion algorithms. A workstation has been developed to expedite the analysis of the algorithms and to integrate the image processing with selectable extended-state tracker modules. This workstation can access analog video imagery from a video optical disk controlled by a PC, segment the target in the image, and perform target identification and aspect angle estimation using a database of target models which span the range of possible aspects. The angle information is then `fused' with kinematic data to augment the tracker state estimator. The workstation is implemented with a powerful visual user interface in a UNIX/X- Windows environment, and includes a wide array of image and signal processing algorithms. Interactive modifications of processing sequences and `what if' analyses are easily conducted. The workstation provides a consistent user interface across a variety of applications. This system has also been used to implement phase retrieval and related image recovery algorithms. Title: Spatial frequency selective error sensing for space-based, wide field-of-view, multiple-aperture imaging systems Authors: Erteza, Ahmed; Schneeberger, Timothy J. Bibcode: 1991SPIE.1527..182E Altcode: High-resolution space-based imaging applications are limited by the difficulty of placing large monolithic mirrors in space and by technology limitations on the diameter achievable in monolithic mirrors. Multiple-mirror imaging systems can overcome these limitations but require precise alignment-error sensing and correcting schemes to maintain all elements in phase. When a wide field of view is desired, the complexity increases substantially since significant error terms will be a function of field angle. Approaches which can reduce the complexity of the error sensing/correcting schemes are thus of great interest. By sampling selected spatial frequencies, representative of both the individual subapertures and errors between subapertures, measurement of all error terms except absolute piston can be achieved. A technique which places a nonredundant mask in the compacted pupil plane of a phased-array imager and senses the selected spatial-frequency magnitude and phase in the focal plane has been analyzed. This technique can reduce complexity in the local error-sensing system while accounting for all tilt, geometry, magnification, and relative piston errors. Title: The response of chromospheric emission lines to flares on YZ Canis Minoris. Authors: Worden, S. P.; Schneeberger, T. J.; Giampapa, M. S.; Deluca, E. E.; Cram, L. E. Bibcode: 1984ApJ...276..270W Altcode: Six flares of the dMe star YZ CMi have been observed with simultaneous photometry and high-dispersion, time-resolved spectroscopy.The spectra have temporal resolutions of 3 minutes with spectral resolutions of 0.24 Å. The largest observed flare had a U band amplitude of 1.5 mag. Hα and Hβ line profiles did not broaden during any of the observed flares, although the line center intensity increased by over a factor of 2 during some flares. After the initial increase in intensity, the emission line strength decreases but remains at enhanced levels for hours following U band flares. The Hα flare luminosity and total energy are compared to corresponding properties of solar flares. Title: Using small aperture interferometry to detect planets in nearby binary star systems Authors: Currie, D. G.; McAlister, H. A.; Schneeberger, T. J.; Worden, S. P. Bibcode: 1983STIN...8331551C Altcode: If suitably accurate binary star orbits can be observed, the effects of planets in the binary star system may be detectable in the reflex motion of the component binary stars. We show that interferometric measurements of binary star systems will provide this information. We discuss the effects of the atmosphere on degrading images and how interferometry will remove these effects to provide very accurate binary star positions relative to the other components in the binary system. Two systems, amplitude interferometry and speckle interferometry, can accomplish this using existing telescopes and techniques. With these methods, nearly accuracies of 0.00002 arc second are possible for binaries of 1 arc second separation and 10000 arc second for a 5 arc binary. These accuracies are more than enough to detect planets in orbits like Jupiter's out to over 20 pc. There are 188 observable systems within 20 pc, in most of which it is possible to have stable planetary orbits similar to solar system orbits. With advanced data recording systems it is possible to observe binary systems where the components are as faint as +16 stellar magnitudes. A dedicated 2-meter interferometric telescope to monitor binary stars could be built for about 1.4 million dollars. Title: Cloudcroft occultation summary .I. December 1978-March 1980. Authors: Radick, R. R.; Africano, J. L.; Rogers, W. F.; Schneeberger, T. J.; Tyson, E. T. Bibcode: 1982AJ.....87..885R Altcode: Results are presented from the first 16 months of a program undertaken to record lunar occultations at Cloudcroft Observatory. The 85 events summarized include 38 observations of stars brighter than seventh magnitude, 26 reappearances, nine angular diameter measurements, and 11 observations of binary stars or stars which may be double. Title: Coordinated X-ray, optical and radio observations of flaring activityon YZ Canis Minoris. Authors: Kahler, S.; Golub, L.; Harnden, F. R.; Liller, W.; Seward, F.; Vaiana, G.; Lovell, B.; Davis, R. J.; Spencer, R. E.; Whitehouse, D. R.; Feldman, P. A.; Viner, M. R.; Leslie, B.; Kahn, S. M.; Mason, K. O.; Davis, M. M.; Crannell, C. J.; Hobbs, R. W.; Schneeberger, T. J.; Worden, S. P.; Schommer, R. A.; Vogt, S. S.; Pettersen, B. R.; Coleman, G. D.; Karpen, J. T.; Giampapa, M. S.; Hege, E. K.; Pazzani, V.; Rodono, M.; Romeo, G.; Chugainov, P. F. Bibcode: 1982ApJ...252..239K Altcode: The YZ Canis Minoris (Gliese 285), a late-type dwarf star with Balmer emission (dM4.5e), is a member of the UV Ceti class of flare stars. Obtaining good X-ray observations of a dMe star flare is important not only for understanding the physics of flares but also for testing current ideas regarding the similarity between stellar and solar flares. The Einstein X-ray Observatory has made it possible to conduct X-ray observations of dMe stars with unprecedented sensitivity. A description is presented of the results of a program of ground-based optical and radio observations of YZ CMi coordinated with those of the Einstein Observatory. The observations were carried out as part of a coordinated program on October 25, 26, and 27, 1979, when YZ CMi was on the dawn side of the earth. Comprehensive observational data were obtained of an event detected in all three wavelength regions on October 25, 1979. Title: High-resolution profiles of chromospheric lines in M dwarf stars. Authors: Worden, S. P.; Schneeberger, T. J.; Giampapa, M. S. Bibcode: 1981ApJS...46..159W Altcode: Forty-six hydrogen and sodium line profiles are presented for 17 selected dwarf M and dwarf M emission line stars. These profiles, derived from echelle spectrograms, typically have 0.25 A spectral resolution. Most of the dMe stars show hydrogen emission lines with central reversals. Central emission features in the cores of the Na D lines are often observed, and the presence of these emission features is strongly correlated with hydrogen line emission. Title: Stellar model chromospheres. XII. High-resolution, absolute flux profiles of the CaII H and K lines in dMe and non-dMe stars. Authors: Giampapa, M. S.; Worden, S. P.; Schneeberger, T. J.; Cram, L. E. Bibcode: 1981ApJ...246..502G Altcode: We present 142 mÅ resolution spectra of the cores and wings of the Ca II H and K lines in three dMe and four comparison dwarf M stars, obtained with the KPNO 4 m echelle spectrograph and blue image tube. The narrow-band photometry of Willstrop and the Barnes and Evans relations for stellar angular diameters convert the observed relative flux to absolute surface flux units with an estimated uncertainty of ± 15 %. We derive chromospheric radiative loss rates in the H and K lines and discuss trends in these loss rates with effective temperature. Monochromatic surface fluxes are tabulated for different features in the H and K lines, and radiation temperatures are derived from the mean surface fluxes at K1 and H1, respectively. We find TR(H1) > TR(K1), consistent with partial redistribution theory. The TR(K1)/Teff ratio is higher in these M dwarfs than the giants studied in Paper X, and it is anomalously high for the dMe flare star YZ CMi. If TR(K1)/Teff is an empirical age indicator, then the result for YZ CMi implies that flare activity and youth are directly correlated, as has been suggested by other investigators. Moreover, the result implies that a high degree of nonradiative heating is present in the upper photospheres of dMe stars. Measurements of line widths at H1 and K1 are presented together with FWHM data for the H and K lines. We find that the scaling law proposed by Ayres generally agrees with the observed trend exhibited by the K1 widths. We also discuss chromospheric radiative loss rates in the Hɛ line compared with loss rates in the H and K lines, and present corrected FWHM(K) widths and compare them to the widths predicted by the Wilson-Bappu relation as calibrated by Lutz. Title: Flare activity on T Tau stars. Authors: Worden, S. P.; Schneeberger, T. J.; Kuhn, J. R.; Africano, J. L. Bibcode: 1981ApJ...244..520W Altcode: Observations of short-period photometric fluctuations in T Tauri stars show flarelike events. These events are consistent with the superposition of many solar-like flare events and have a power-spectrum frequency dependence of ∼f-2. This dependence is the same as that observed on UV Ceti stars. The flare events are very powerful, and the expected proton flux from these events may explain early solar system abundance anomalies without recourse to nearby supernovae. The flare events are consistent with the observations of mass loss in these stars. Title: Observational Astronomy at the Cloudcroft Observatory Authors: Schneeberger, Timothy J.; Worden, S. P. Bibcode: 1980srca.conf...67S Altcode: No abstract at ADS Title: Cloudcroft Observatory Today Authors: Schneeberger, Timothy J.; Worden, S. P.; Africano, J. L.; Tyson, E. Bibcode: 1980S&T....59..109S Altcode: No abstract at ADS Title: New Photometric Observations of EX Hydrae Authors: Africano, J. L.; Quigley, R.; Schneeberger, T. J.; Worden, S. P. Bibcode: 1979BAAS...11..649A Altcode: No abstract at ADS Title: Observations of Coronal Oscillations above an Active Region Authors: Egan, T. F.; Schneeberger, T. J. Bibcode: 1979SoPh...64..223E Altcode: Periodic Doppler width fluctuations have been observed in Fe XIV spectra above an active region. The oscillations have a period of 6.1 ± 0.6 min and a peak-to-peak amplitude of 0.07 ± 0.006 Å. The amplitude of the oscillation increases with height above the limb, and is enhanced at specific heights where we marginally detect line center intensity oscillations. The intensity fluctuations have a period of 6.1 min, an amplitude of 2.0 ± 1.4%, and are 180 ° out of phase with the width oscillations. A comparison region in the quiet corona showed no evidence of oscillatory phenomena. Title: Flare Activity on T Tauri Stars Authors: Schneeberger, T. J.; Worden, S. P.; Kuhn, F. R.; Africano, J. L. Bibcode: 1979BAAS...11..628S Altcode: No abstract at ADS Title: High Resolution Spectra of Stellar Flares Authors: Worden, S. P.; Schneeberger, T. J.; Deluca, E.; Giampapa, M. Bibcode: 1979BAAS...11..628W Altcode: No abstract at ADS Title: The Ca II H and K Lines in dMe and non-dMe Stars Authors: Giampapa, M. S.; Worden, S. P.; Schneeberger, T. J.; Cram, L. E. Bibcode: 1979BAAS...11..625G Altcode: No abstract at ADS Title: High-resolution line profiles of T Tau stars. Authors: Schneeberger, T. J.; Worden, S. P.; Wilkerson, M. S. Bibcode: 1979ApJS...41..369S Altcode: Thirty-three relative intensity hydrogen and sodium line profiles obtained from spectra of 10 T Tauri stars are presented. These profiles were derived from echelle spectrograms having a typical resolution of 0.20 A. The T Tauri stars observed span the range of emission-intensity classes listed in Herbig and Rao (1972). Seventy percent of the H alpha profiles show blue-displaced absorption components with velocities up to 250 km/sec. Na D emission features are observed in all the stars with emission-intensity classes higher than 2. The Na D lines in T Tauri show intensity changes on a time scale of months. The H alpha-line equivalent width in T Tauri can change by 40% in 3 days. Title: The lifetimes of sunspot moats. Authors: Pardon, L.; Worden, S. P.; Schneeberger, T. J. Bibcode: 1979SoPh...63..247P Altcode: Daily full disk magnetograms observed with the Kitt Peak 40 channel magnetograph have been examined for the rise time, decay time and lifetime of sunspot moats. Eighteen well defined moats result in rise and decay times of 0.5d ± 1d, with a lifetime at maximum development of 6d ± 3d. The moat appears approximately 3 days after the spot is observed in our data. Title: The night sky conditions at the Sacramento Peak Observatory. I. Sky brightness. Authors: Schneeberger, T. J.; Worden, S. P.; Beckers, J. M. Bibcode: 1979PASP...91..530S Altcode: The night sky brightness at Sacramento Peak Observatory has been monitored over a period of nine months. The average zenith sky is 21.9 ± 0.1 mυ arc sec-2. The night sky brightness shows fluctuations of up to 25% during this period. The long record of daytime sky-brightness observations shows a strong seasonal effect with brightest skies occurring in the early summer months. This seasonal effect is marginally present in the night sky brightness results. Light pollution from the closest urban areas is also detailed. Title: Chromospheric emission lines in the red spectrum of AD Leonis. II. Physical conditions in flares. Authors: Schneeberger, T. J.; Linsky, J. L.; McClintock, W.; Worden, S. P. Bibcode: 1979ApJ...231..148S Altcode: Simultaneous photometry and time-resolved spectra of the dMe flare star AD Leo has been used to deduce flare temperatures, electron densities, and dimensions. Photometric results for two qualitatively different flares yield estimates of the differences in physical properties between these flares. Flares on AD Leo are hotter and denser than their solar counterparts, and spike-like flares occupy smaller volumes than longer-lived flares. An upper limit to the flare X-ray luminosity is set atL <4 x l028ergss-1. Subject headings: stars: chromospheres - stars: emission-line - stars: flare - stars: individual Title: Short Time Scale Brightness Fluctuations in BP Tauri Authors: Schneeberger, T. J.; Worden, S. P.; Africano, J. L. Bibcode: 1979IBVS.1582....1S Altcode: No abstract at ADS Title: Short Time Scale Brightness Fluctuations in T Tauri Stars. Authors: Schneeberger, T. J.; Worden, S. P.; Africano, J. L. Bibcode: 1979BAAS...11..439S Altcode: No abstract at ADS Title: Period Variation of UX Ursae Majoris in 1979 Authors: Quigley, R.; Africano, J. L.; Schneeberger, T. J.; Worden, S. P. Bibcode: 1979BAAS...11..445Q Altcode: No abstract at ADS Title: The Cloudcroft Observatory 48 inch telescope. Authors: Africano, J. L.; Schneeberger, T. J.; Worden, S. P. Bibcode: 1979BAAS...11..392A Altcode: No abstract at ADS Title: Chromospheric emission lines in the red spectrum of AD Leonis. I. The nonflare spectrum. Authors: Giampapa, M. S.; Linsky, J. L.; Schneeberger, T. J.; Worden, S. P. Bibcode: 1978ApJ...226..144G Altcode: High-resolution red (5300-7300 A) spectra of the flare star AD Leonis were obtained with the Kitt Peak 4 m echelle spectrograph system at a spectral resolution of 0.22 A at Ha. A series of time-trailed plates with 5 hours integration in total were averaged together to obtain a representation of the star's nonflaring spectrum with high signal-to-noise ratio. The He i A5876 triplet line and A6678 singlet line appear in emission with measured equivalent widths of 0.312 + 0.016 A and 0.058 + 0.029 A, respectively. The corresponding triplet-to-singlet line flux ratio is 3.7, close to the ratio of the level statistical weights. We argue that the He i lines are not produced by recombination and cascade following photoionization by A < 504 A coronal photons, but are instead collisionally excited. We suggest that these lines are formed in a geometrically thin chromospheric layer at 20,000-50,000 K with a column density of nel 6 x 1018 . The sodium D emission lines (A5890, AS 896) are found to be stellar in origin, with measured FWHM of 0.7 A for both lines, and the Ha line has a FWHM of 1.4 A. No other chromospheric emission lines were found in this spectral region. Subject headings: stars: chromospheres - stars: emission-line - stars: flare - stars: individual Title: The Spectrum of T Tauri Star BM AND. Authors: Schneeberger, T. J. Bibcode: 1978BAAS...10Q.453S Altcode: No abstract at ADS Title: Problems in the Interpretation of Cluster Membership Probabilities Authors: McNamara, B. J.; Schneeberger, T. J. Bibcode: 1978A&A....62..449M Altcode: Summary. The degree to which the combination of proper motions of various accuracies and deleting from the vector point diagram influences computed cluster membership probabilities using the maximum likelihood technique as employed by Sanders (1971) is investigated. Results obtained from the recently published proper motion data for M 11 suggest that both of these effects can have a significant influence on the calculated membership probabilities. Key words: galactic clusters membership probabilities Title: The helium triplet-to-singlet ratio in T Tauri stars. Authors: Schneeberger, T. J.; Linsky, J. L.; Worden, S. P. Bibcode: 1978A&A....62..447S Altcode: Summary. The He ilines at 5876 and 6678 are used to determine the triplet-to-singlet ratio for T Tauri stars DF Tau and BP Tau. The ratio is approximately 3. Line profiles and absolute intensities are presented. Key words: T Tauri stars helium lines Title: Balmer emission lines in T Tauri-like decelerating flows Authors: Schneeberger, Timothy James Bibcode: 1978PhDT.......334S Altcode: No abstract at ADS Title: Balmer Line Profiles in Decelerating Atomsphere Authors: Schneeberger, Timothy J.; Beebe, H. A. Bibcode: 1978srca.conf...69S Altcode: No abstract at ADS Title: Balmer Emission Lines in T Tauri-Like Decelerating Flows. Authors: Schneeberger, T. J. Bibcode: 1978PhDT.........1S Altcode: The star and envelope properties are chosen to approximate T Tauri star conditions. The Sobolev approximation is used to solve the radiative transfer problem in the envelope and the application of this technique to decelerating atmospheres is discussed. A ten-level model hydrogen atom including forty-five line transitions is utilized and the effects of changes in the adopted collisional cross sections and recombination rates are determined. The details of the solutions of the hydrogen level populations are presented for a range of envelope conditions. The effects of changes in the effective temperature of the central star, the electron temperature of the envelope, the stellar mass loss ratio and the initial flow velocity in the decelerating envelope are discussed. The Balmer line profiles are computed by integrations along surfaces of equal line of sight velocity. Changes in emission line strengths and shapes and the behavior of the Balmer decrement were determined for a range of envelope conditions. Title: Chromospheric Emission Lines in the Quiescent Spectrum of the Flare Star AD Leo Authors: Giampapa, M. S.; Linsky, J. L.; Schneeberger, T. J.; Worden, S. P. Bibcode: 1977BAAS....9..593G Altcode: No abstract at ADS Title: Simultaneous Photometry and Time Resolved Spectra of Flare Star AD Leo Authors: Schneeberger, T. J.; Worden, S. P.; Linsky, J. L.; McClintock, W. Bibcode: 1977BAAS....9Q.593S Altcode: No abstract at ADS Title: Alfvén waves in the corona above sunspots. Authors: Beckers, J. M.; Schneeberger, T. J. Bibcode: 1977ApJ...215..356B Altcode: From the line width in coronal arches above sunspots it is possible to estimate the amount of Alfven wave flux escaping from the spot into the solar corona. It is found to be less than 4 x 10 to the 7th ergs/sq cm/s in the corona just above the spot, which is less than 0.08% of the missing spot flux. If the Alfven-wave cooling mechanism for spots is to be valid, these waves have therefore to escape downward into the solar interior. Title: Balmer line profiles in decelerating atmospheres. Authors: Schneeberger, T. J.; Beebe, H. A. Bibcode: 1977srca.conf...69S Altcode: No abstract at ADS Title: Nova Vulpeculae 1976 Authors: Neff, J. S.; Smith, V. V.; Ketelsen, D. A.; Osawa, K.; Dawson, D.; Schneeberger, T.; Roemer, T.; Solomon, S.; Whitney, C. A.; Schmidt, T. E.; Maley, P.; Bortle, J. Bibcode: 1976IAUC.3001....1N Altcode: J. S. Neff, Department of Physics and Astronomy, University of Iowa, reports further monochromatic magnitudes, obtained with the assistance of V. V. Smith and D. A. Ketelsen: Oct. 29.04 UT, 7.8; Nov. 1.02, 6.8. These monochromatic magnitudes, which refer to a wavelength of 5500 A (not 6500 A, as was stated on IAUC 3000), are derived by comparison of the continuum intensity in a 30-A band centered at this wavelength in the spectra of the nova and the star 7 Vul, the magnitude of the latter being assumed equal to its V magnitude of 6.3. On Oct. 29 and Nov 1 the peak flux of H-beta had increased to some three times that of the adjacent continuum. On the latter date, several other emission features were detected, including H-gamma, H-delta, H-epsilon (and/or Ca II) and evidently Fe II and Ti II lines. The following photoelectric magnitudes have been reported: 1976 UT V B - V U - B Observer Oct. 22.46 7.02 +1.29 Osawa 22.49 7.07 +1.38 +1.00 " 22.51 7.11 +1.44 +1.06 " 24.068 7.29 +1.40 +0.39 Dawson 26.094 6.87 +1.18 +0.40 Schneeberger 25.153 7.33 +1.27 +0.23 Roemer & Solomon 29.052 7.03 +1.14 Whitney K. Osawa (Tokyo Astronomical Observatory, Okayama Station). D. Dawson, T. Schneeberger, T. Roemer and S. Solomon (New Mexico State University). Several reference stars used. 61-cm reflector, Tortugas Station, and 91-cm reflector, Blue Mesa Station. C. A. Whitney (Harvard College Observatory, Agassiz Station). 40-cm reflector. Comparison star BD +20 4179 (assumed V = 7.29, B-V = +0.26). Delta-U (nova - comparison) = +0.51. Selected visual magnitude estimates: Oct. 30.06 UT, 7.1 (T. E. Schmidt, Tiara Observatory); 31.05, 7.3 (P. Maley, Houston, Texas); Nov. 1.06, 6.8 (Schmidt); 2.01, 7.0 (J. Bortle, Brooks Observatory). Title: Non-LTE profiles of strong solar lines Authors: Schneeberger, T. J.; Beebe, H. A. Bibcode: 1976CONMS...1..110S Altcode: 1976conm....1..110S The complete linearization method is applied to the formation of strong lines in the solar atmosphere. Transitions in Na(I), Mg(I), Ca(I), Mg(II), and Ca(II) are computed with a standard atmosphere and microturbulent velocity model. The computed profiles are compared to observations at disk center. Title: Emissivities and detectability of the pure rotational transitions of molecular hydrogen Authors: Schneeberger, T. J. Bibcode: 1976CONMS...1..123S Altcode: 1976conm....1..123S The emissivities of the infrared rotational transitions of H2 are calculated for temperatures from 10 K to 6000 K. The calculations are made for several ratios, R, of Para (J=0) to Ortho (J=1)H2. The possibility of detecting these transitions in interstellar molecular clouds is discussed. Title: Non-LTE profiles of strong solar lines. Authors: Schneeberger, T. J.; Beebe, H. A. Bibcode: 1976CNMSU...1..110S Altcode: No abstract at ADS Title: Emissivities and detectability of the pure rotational transitions of molecular hydrogen. Authors: Schneeberger, T. J. Bibcode: 1976CNMSU...1..123S Altcode: No abstract at ADS Title: Nova Cygni 1975 Authors: Strittmatter, P. A.; Fawley, W.; Schommer, R.; Deeter, J.; Wallerstein, G.; Tedesco, E. F.; Herzog, A.; Schneeberger, T.; Sherrod, C.; di Cicco, D.; Jacchia, L. Bibcode: 1975IAUC.2830....1S Altcode: The following photoelectric magnitudes have been reported: 1975 UT V B - V U - B V - R R - I b - y Observer Aug. 30.3 1.98 +0.51 -0.81 +0.57 +0.15 Strittmatter 30.40 2.01 +0.40 Fawley 30.52 2.02 " 31.25 1.92 +0.64 -0.11 Schommer 31.3 1.87 +0.62 -0.65 +0.82 +0.21 Strittmatter 31.33 1.90 +0.64 +0.02 Tedesco 31.51 2.02 +0.65 -0.15 Schommer Sept. 1.3 2.26 +0.55 -0.69 +1.03 +0.20 Strittmatter 1.31 2.61 +0.49 -0.21 Tedesco 1.47 2.80 +0.49 -0.40 Schommer 2.18 3.73 +0.34 -0.52 " 2.19 3.96 +0.38 Fawley 2.32 4.19 +0.35 " 2.38 4.24 +0.34 " 2.47 4.02 +0.31 -0.54 Schommer P. A. Strittmatter et al. (University of Arizona). W. Fawley (University of California, Berkeley). R. Schommer and J. Deeter (University of Washington). From the extremely rapid decline G. Wallerstein deduces M_v = -9.2. E. F. Tedesco, A. Herzog, T. Schneeberger and G.Garwood(New Mexico State University). Comparison star epsilon Cyg. Errors ~ +/- 0.02. The following recent visual magnitude estimates have been reported: Sept. 3.07, 4.2 (C. Sherrod, North Little Rock, Arkansas); 3.10, 3.7 (D. di Cicco, Waltham, Massachusetts); 3.21, 4.8 (Sherrod); 4.07, 4.8 (L. Jacchia, Cambridge, Massachusetts); 4.08, 4.9 (Sherrod); 4.10, 4.7 (di Cicco). Title: Spatial Inhomogeneities in the Cores of Strong Lines in the Solar Spectrum. Authors: Schneeberger, T. J.; Beebe, H. A. Bibcode: 1975BAAS....7..448S Altcode: No abstract at ADS