Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260..132j&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 1, p. 132-140.
Astronomy and Astrophysics
Astronomy
13
Binary Stars, Chromosphere, Main Sequence Stars, Stellar Activity, White Dwarf Stars, Emission Spectra, Far Ultraviolet Radiation, H Alpha Line, Spectral Line Width, Stellar Atmospheres, Stellar Evolution, Stellar Spectra
Scientific paper
We report the discovery of a new short-period, main sequence, chromospherically active late-type binary system. EUV observations performed by the ROSAT Wide Field Camera have identified the late-type star GL 841A as a possible very active star by virtue of a large EUV-to-bolometric flux ratio. Subsequent optical observations at the wavelengths of the H-alpha and Ca II H and K lines have confirmed this, and also the binary nature of the system. An orbital period of 1.124 d, an inclination of 28 deg and a mass ratio of approximately unity are deduced from radial velocity data. Both components show H-alpha in emission. The photometric colors and absolute magnitude indicate that the component stars are both spectral class dM3-5e. The GL 841A system is similar in many respects to the young eclipsing binary YY Gem.
Bromage Gordon E.
Jeffries Robin D.
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