THE CHROMOSPHERIC ACTIVITY OF [HH97] FS Aur-79: A CLOSE BINARY WITH LATE-TYPE ACTIVE (dK7e+dM3e) COMPONENTS
- Department of Physics and Astronomy, University of Central Arkansas, Conway, AR 72035 (United States)
- Department of Physical Sciences, Arkansas Tech University, Russellville, AR 72801-2222 (United States)
- Departamento de Fisica, GAS, Universidade Federal de Santa Catarina, Grupo de Astrofisica da UFSC, Campus Trinidade, 88040-900 Florianopolis, SC (Brazil)
- Department of Physics, Central Michigan University, Mount Pleasant, MI 48859 (United States)
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 H{alpha} and H{beta} 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{sup -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 {lambda}6708 in the spectra lets us put a lower limit on the age of this system to at least 500 Myr.
- OSTI ID:
- 21583167
- Journal Information:
- Astronomical Journal (New York, N.Y. Online), Vol. 141, Issue 4; Other Information: DOI: 10.1088/0004-6256/141/4/124; ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
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