Search Publications
The continuum variability of the puzzling X-ray three-period cataclysmic variable 2A 0526-328 (TV Col).
Motch, C.; Bonnet-Bidaud, J. M.; Mouchet, M.
TV Col is characterized on the basis of 120-195-nm and 190-320-nm large-aperture low-dispersion IUE spectra obtained between April 1980 and May 1982, UBV measurements obtained with the 1-m telescope at ESO in November 1979 (Motch, 1981), and JHK photometry obtained using the standard IR photometer on the 3.6-m telescope at ESO on Dec. 31, 1982. Th…
The International Ultraviolet Explorer (IUE) point spread function at low resolution.
Cassatella, A.; Barbero, J.; Benevenuti, P.
The resolution performances obtainable with IUE low resolution images are reviewed. It is shown that the spatial resolution (perpendicular to the dispersion) is strongly dependent on the telescope focussing conditions while the spectral resolution is not. After determining the telescope optimum focussing conditions, information is provided on the …
Effects of nuclear uncertainties and chemical evolution on the standard big bang nucleosynthesis
Gry, C.; Audouze, J.; Delbourgo-Salvador, P. +1 more
It is shown that consistent predictions of baryonic densities can be made only for some specific galactic-evolution models involving D and He-3: either the infall of already processed material such that D/Dp = 1/15 (where Dp is the primordial abundance of D and D is the present value) or the effect of stellar mass loss releasing D free He-3 rich m…
COS-B gamma-ray sources and interstellar gas in the first galactic quadrant. Caravane collaboration for the COS-B satellite.
Caraveo, P. A.; Bignami, G. F.; Strong, A. W. +8 more
The consequences are considered for the high-energy gamma-ray sources of the recently established correlation between the intensity above 300 MeV, and tracers of atomic and molecular gas, in the first quadrant of the Galaxy. Using a likelihood method on the complete set of COS-B data, it is shown that there are point-like gamma-ray sources which d…
Atmospheric parameters of the variable DB white dwarf GD 358.
Koester, D.; Weidemann, V.; Vauclair, G. +3 more
This paper presents new observations of GD 358, the prototype of the class of variable white dwarfs with helium-dominated atmospheres (DB). These data, together with previous observations, are analyzed using new model atmosphere calculations. The results are Teff = 24000±1000K, log g = 8.0±0.3. This temperature is within the range predi…
Star formation and chemical abundances in the blue compact galaxy ESO338-IG04.
Bergvall, N.
The blue compact galaxy ESO 338 - IG04, which is undergoing a burst of star formation, is luminous for its type and has extremely blue colors. Attention is given to new broadband UBVIR photometry, spectroscopy, and both direct photographic and CCD observations of this galaxy, together with the reanalysis of a low resolution IUE spectrum. In H-alph…
The development of the new Be phase of 59 CYG in the visual and in the far UV in 1978-1983.
Bolton, C. T.; Grady, C. A.; Stalio, R. +10 more
A tentative synthesis of visual and IUE observations of 59 Cyg during 1978-1983 when the new Be phase began to develop is presented. The study reveals correlation between those spectral features originating in the cool H-alpha-emitting envelope and features originating in superionized regions exhibiting C IV and N V lines. The long-term variabilit…
Models for the planetary nebulae NGC 4361 and NGC 1535 : influence ofthe stellar wind on the nebular ionization.
Koeppen, J.; Adam, J.
Model atmospheres fitted to line profiles of the central stars (Méndez et al., 1981) are used to construct nebular ionization models for the planetary nebulae NGC 4361 and 1535. For NGC 4361 the optical and IUE nebular emission lines are reproduced satisfactorily well. For NGC 1535 the model atmospheres only emit less than 10-3 of the n…
The old nova V603 AQL : an intermediate polar ?
Haefner, R.; Metz, K.
A total of 1510 UVB photometric observations obtained with the 50-cm telescope at ESO in 13 6-h runs during July-August 1981 and two-channel polarimeter measurements obtained at the 60-cm Bochum and 1-m telescopes at ESO during the same period are reported for the old nova V 603 Aql. The data are presented in graphs and tables and characterized in…
The interstellar radiation field and the production of inverse-Compton gamma rays in the Galaxy
Bloemen, J. B. G. M.
An empirical model for the large-scale galactic distribution of the various components of the interstellar radiation field is constructed using recent observations, and the spectral and spatial distribution of inverse Compton (IC) gamma ray production in the Galaxy is determined using the most recent estimate of the interstellar electron spectrum …