The eclipsing binary U Sagittae: evidence for CNO processing and massexchange in the past.
Abstract
The authors have determined the system parameters of U Sagittae. The components are of spectral types B7.5 V and G4 IV-III, and the system is at a distance of approximately 290 pc. The authors confirm the conclusion by Tomkin that the masses are about 5.5 and 1.9 solar masses, respectively. The system is a typical semidetached system of the Algol type. The profiles of the absorption lines on high-dispersion IUE spectra can be matched if solar abundances are assumed except for carbon and nitrogen. The abundance of carbon is only 9% of its solar abundance, and N is overabundant by about a factor of 4.5. It is concluded that the system underwent large mass transfer.
- Publication:
-
NASA Conference Publication
- Pub Date:
- December 1984
- Bibcode:
- 1984NASCP2349..412D
- Keywords:
-
- Astronomy;
- Eclipsing Binary Stars;
- Mass Transfer;
- Stellar Spectra;
- Balmer Series;
- Stellar Atmospheres;
- Stellar Mass Accretion;
- Algol Systems:Semi-Detached Systems;
- Distances:Eclipsing Binaries;
- Eclipsing Binaries:Distances;
- Eclipsing Binaries:Masses;
- Eclipsing Binaries:Spectral Classification;
- Eclipsing Binaries:UV Spectra;
- Masses:Eclipsing Binaries;
- Semi-Detached Systems:Algol Systems;
- Spectral Classification:Eclipsing Binaries;
- UV Spectra:Eclipsing Binaries