HD 115781 and HD 116204 - Two RS CVn binaries

Details HD 115781 and HD 116204 - Two RS CVn binaries HD 115781 and HD 116204 - Two RS CVn binaries

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988japa....9..213g&link_type=abstract

Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 9, Dec. 1988, p. 213-224. Research supported by SERC.

Astronomy and Astrophysics

Astrophysics

9

Astronomical Photometry, Astronomical Spectroscopy, Binary Stars, Emission Spectra, Radial Velocity, Stellar Spectra, Calcium, H Alpha Line, Iue, Stellar Orbits, Subgiant Stars

Scientific paper

HD 115781 and HD 116204 (BL CVn and BM CVn) are shown to be RS CVn binaries with periods near 20 days. HD 115781 is double-lined. The primary type is about K1 III, while the secondary is probably a late-type subgiant. The masses of the two components are equal within observational error. HD 116204 is also of type K1 III. It shows exceptionally strong Ca II H and K emission, together with an emission-line spectrum typical of RS CVn stars in the IUE ultraviolet region, but H-alpha is an absorption line. The secondary star in the HD 116204 system has not been detected.

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