Abstract
view Abstract Citations (38) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Orbits of Close Binaries with CaII H and K in Emission. I. Z Herculis and RS Canum Venaticorum Popper, Daniel M. Abstract 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. Publication: The Astronomical Journal Pub Date: April 1988 DOI: 10.1086/114719 Bibcode: 1988AJ.....95.1242P Keywords: Binary Stars; Line Spectra; Radial Velocity; Stellar Mass; Stellar Orbits; Stellar Spectrophotometry; Absorption Spectra; Eclipsing Binary Stars; Stellar Spectra; Stellar Temperature; Astrophysics; STARS: BINARIES full text sources ADS | data products SIMBAD (2) Related Materials (5) Erratum: 1992AJ....104..412P Part 2: 1988AJ.....96.1040P Part 3: 1990AJ....100..247P Part 4: 1991AJ....101..220P Part 5: 1991AJ....102..699P
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