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The Cataclysmic Variable Ss-Cygni
Giovannelli, F.; Martinez-Pais, I. G.
In this work we will try to give the most general panorama, comparatively with the conciseness, on SS Cygni which is the brightest dwarf nova. The dwarf novae form a sub-class of the more vaste panorama of the Cataclysmic Variables (CVs). For this reason firstly we will describe in general the CVs and the current theories which attempt to describe…
A Note on the Statistical Evaluation of Compressed Mass Spectra Obtained from Dust Particles in the Coma of Comet Halley
Jessberger, E. K.; Fomenkova, M.; Mukhin, L. +4 more
A weighing factor for individual dust grains based on an independent determination of the particle mass (rather than summing up the total number of ions of an element measured in all spectra) is established for the calculation of the average dust composition. The ion ratio distribution obtained from particles with different masses independent of c…
A Catalogue of Low-Resolution IUE Spectra of Dwarf Novae and Nova like Stars
La Dous, Constanze
A catalogue is presented of all the low-resolution IUE spectra of dwarf novae and nova-like stars that were recorded until the end of 1987. All spectra have been reduced, and are displayed, in a homogeneous way. In addition to details about these data, to the extent available, their position in the outburst light curves is given, physical informat…
500 3200 Å observations of the interacting binary stars V356 Sgr and β Lyr
Polidan, R. S.
In this paper we present new results from the Voyager ultraviolet spectrometers and the IUE spacecraft on V356 Sgr and β Lyr. The V356 Sgr observations cover, in detail, two eclipses and include one IUE high dispersion SWP image. During both eclipses the total strength of the UV emission lines were found to be invariant. Also, an uneclipsed UV con…
Mass Flow in Interacting Binaries Observed in the Ultraviolet
Kondo, Yoji
Recent satellite observations of close binary systems show that practically all binaries exhibit evidence of mass flow and that, where the observations are sufficiently detailed, a fraction of the matter flowing out of the mass-losing component is accreted by the companion and the remainder is lost from the binary system. The mass flow is not cons…
COS-B views on the diffuse galactic gamma-ray emission and some point sources
Hermsen, W.
The correlation between diffuse galactic gamma rays and gas tracers is studied using the final COS-B database and H i and CO surveys covering the entire galactic plane. A good quantitative fit to the gamma rays is obtained, with a small galacto-centric gradient in the gamma-ray emissivity per hydrogen atom. The average ratio of H2 colum…
A Catalogue of Low Resolution IUE Spectra of Dwarf Novae and Nova-Like Stars
La Dous, Constanze
A catalogue is presented of all the low-resolution IUE spectra of dwarf novae and nova-like stars that were recorded until the end of 1987. All spectra have been reduced, and are displayed, in a homogeneous way. In addition to details about these data, to the extent available, their position in the outburst light curves is given, physical informat…
The Comet Halley Dust and Gas Environment
Keller, H. U.; Gombosi, T. I.; Sekanina, Z. +8 more
Quantitative descriptions of environments near the nucleus of comet P/Halley have been developed to support spacecraft and mission design for the flyby encounters in March, 1986. To summarize these models as they exist just before the encounters, we review the relevant data from prior Halley apparitions and from recent cometary research. Orbital e…
Semidetached Systems - Evolutionary Viewpoints and Observational Constraints
De Greve, J. P.
The present knowledge on the evolution of semidetached systems is reviewed. Characteristics of observed systems are discussed and general properties tested by the behaviour of theoretical models. New models of mass accreting companion stars are computed. The accretion phase is divided into a fast and slow phase with an accretion rate depending on …
The Structure of Low-Mass X-Ray Binaries
White, N. E.; Mason, K. O.
The present knowledge of the structure of low-mass X-ray binary systems is reviewed. We examine the orbital period distribution of these sources and discuss how the orbital periods are measured. There is substantial observational evidence that the accretion disks in low-mass X-ray binaries are thick and structured. In a number of highly inclined s…