Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.130..119m&link_type=abstract
(IAU, DFG, and Bayerisches Staatsministerium für Unterricht und Kultus, Colloquium on Cataclysmic Variables, Recent Multi-Freque
Astronomy and Astrophysics
Astrophysics
1
Binary Stars, Cataclysmic Variables, Stellar Spectra, White Dwarf Stars, Light Curve, Stellar Activity, Stellar Envelopes, Stellar Spectrophotometry
Scientific paper
The results of photoelectric and spectral observations of SS Cyg are briefly discussed. Some features of the spectral variations observed during a large outburst of SS Cyg can probably be explained using a model of a double star which is surrounded by an absorbing gaseous shell. It is noted that the existing data are not numerous enough for the explanation of the SS Cyg variability, in particular, its short-term variations. SS Cyg is a spectroscopic binary star with a 0.276 d period. The components of this system are dwarf stars (M of about 5.5 m for both stars), with dG5 and SdBe spectra; they probably show eruptive activity (Joy, 1956). In the spectrum of the B-component, strong emission lines are observed. The dG5 spectrum is observed only in the minimum of SS Cyg. There are various investigations of SS Cyg, but up to now the cause of its variability, in particular, its rapid variability, has not been determined. In addition, there are many other observations which have not been explained.
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