Orbits of close binaries with CA II H and K in emission. I - Z Herculis and RS Canum Venaticorum

Details Orbits of close binaries with CA II H and K in emission. I - Z Herculis and RS Canum Venaticorum Orbits of close binaries with CA II H and K in emission. I - Z Herculis and RS Canum Venaticorum

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95.1242p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 95, April 1988, p. 1242-1250. Research supported by the University of California, an

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33

Binary Stars, Line Spectra, Radial Velocity, Stellar Mass, Stellar Orbits, Stellar Spectrophotometry, Absorption Spectra, Eclipsing Binary Stars, Stellar Spectra, Stellar Temperature

Scientific paper

This paper is the first of a series on the accumulated Lick spectrograms of close binaries with Ca II H and K in emission. For Z Her and RS CVn, but not for most of the other systems, orbits based on the author's older material had been published and the systems analyzed. The principal change is a significant increase of the masses derived for the components of Z Her. Interstellar Na D lines blending with the stellar lines had caused the earlier underestimate. This change makes even more striking than before the uniqueness of Z Her among detached subgiant binaries, in that the presumably more evolved, cooler, and larger star is the less massive, a condition requiring a greater amount of mass to have been lost from this component than postulated previously, or, alternatively, that this star be in a short-lived state of pre-main-sequence contraction. The new results give a mass ratio for RS CVn closer to unity than previously, with the more evolved star slightly the more massive, as in other detached RS CVn systems. Temperature and flux scales for subgiants are introduced, and problems in dealing with variable light curves are discussed briefly.

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