Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..412d&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 412-415 (SEE N85-20961 1
Astronomy and Astrophysics
Astronomy
Eclipsing Binary Stars, Mass Transfer, Stellar Spectra, Balmer Series, Stellar Atmospheres, Stellar Mass Accretion
Scientific paper
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.
Dobias Jan J.
Plavec Mirek J.
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