Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20923006a&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #230.06; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We find that the secondary photometric standard star #79 for the FS Aur field (Hendon & Honeycutt 1997) designated as [HH97] FS Aur-79 (GSC 1874 399) is a short period (0.2508 days) eclipsing near-contact binary system with dK7e and dM4e components. The system has a gamma-velocity of about +83 km/sec, with the primary having an orbital velocity around 115 km/sec, and the secondary predicted to have an orbital velocity near 210 km/sec. The primary mass, temperature, and radius are approximately 0.6M&sun;, 4100 K, and 0.67 R&sun;. The secondary mass, temperature, radius are approximately 0.3M&sun;, 3425 K, and 0.48 R&sun;. The unequal eclipse depths indicate a temperature difference between the components (near contact), and unequal quadrature magnitudes indicating the presence of star spots. A U-B excess, and H-Balmer lines in emission are further evidence of chromospheric activity. Modeling indicates the presence of two major spot regions on the primary and one on the secondary. It is likely that this system has evolved from larger separations through angular momentum loss. This system may eventually become an W UMa system with unique late-type components, which is rare.
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