Orbits of close binaries with CA II H and K in emission. IV - Three systems with mass ratios far from unity

Details Orbits of close binaries with CA II H and K in emission. IV - Three systems with mass ratios far from unity Orbits of close binaries with CA II H and K in emission. IV - Three systems with mass ratios far from unity

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..220p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, Jan. 1991, p. 220-229. Research supported by the U.S. Navy and NSF.

Astronomy and Astrophysics

Astronomy

18

Eclipsing Binary Stars, Emission Spectra, Stellar Orbits, Accretion Disks, Light Curve, Starspots, Stellar Luminosity, Stellar Magnitude, Stellar Spectrophotometry

Scientific paper

The properties of three semidetached systems with mass ratios differing greatly from unity, AD Cap, RT Lac, and RV Lib, are discussed. Ca II H and K emission is present in both components of each system, the emission appearing stronger in the hotter, detached components. All three system show irregularities and changes in their light curves, although photometric material is available in appreciable quantity only for RT Lac. The spectral types of the detached, hotter, more massive components of RT Lac and RV Lib are much later than the types of main-sequence stars of the same mass. However, the masses, mass ratios, and orbital angular momenta if these systems lie within the same ranges as in 'classical' Algol systems, for which the spectral types of the detached components are generally similar to those of the stars in detached binaries with the same masses. Possible explanations for this dichotomy are examined.

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