Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aj....141..124a&link_type=abstract
The Astronomical Journal, Volume 141, Issue 4, article id. 124 (2011).
Astronomy and Astrophysics
Astronomy
Binaries: Close, Binaries: Eclipsing, Binaries: Spectroscopic, Stars: Late-Type
Scientific paper
Using Doppler tomography we show that FS Aur-79, a near-contact close binary system with late-type active dK7e+dM3e components, has chromospheric prominences in two distinct emission regions associated with the primary star and a larger amount of chromospheric activity associated with the cooler secondary star. The line profiles, equivalent widths, and equivalent width ratios of the Hα and Hβ emission lines as a function of orbital phase further support that the majority of the chromospheric emission originates above the secondary star and near the neck region. Analysis of high-resolution spectra using the technique of broadening functions has enabled us to determine the radial velocity of the secondary star near quadratures to be approximately 224 km s-1. A Wilson-Devinney model of the system fitting the UBV light curves and radial velocities shows that there are star spots near the chromospherically active regions. Finally, the absence of Li I λ6708 in the spectra lets us put a lower limit on the age of this system to at least 500 Myr.
Austin Scott Jerry
de Souza R. T.
Honeycutt Kent R.
Robertson John W.
Tycner Christopher
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