The masses of cool supergiants: the interacting eclipsing system AZ Cassiopeiae.
Abstract
Data are presented from 63 spectrograms covering two cycles of the nine-year eclipsing system AZ Cas. The orbital elements are derived and it is seen that mass is lost from the M supergiant primary at periastron passage in an eccentric (e 0.55) orbit. Several arguments suggest masses of 13 and 18 `A)(' for the B and M stars, respectively. Spectroscopic phenomena are discussed which indicate the complexity of the mass flows in the system. Difficulties in interpretation of some of the observations remain. A short discussion is given of the observed masses of cool supergiants. Key words: binaries, spectroscopic-binaries, eclipsing- mass exchange-massive stars
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- December 1977
- DOI:
- 10.1086/130241
- Bibcode:
- 1977PASP...89..882C
- Keywords:
-
- Eclipsing Binaries:Mass Exchange;
- Eclipsing Binaries:Masses;
- Eclipsing Binaries:Spectra;
- Late-Type Supergiants:Masses