Common chromospheres - roundchroms - as a means for the study of binary systems

Details Common chromospheres - roundchroms - as a means for the study of binary systems Common chromospheres - roundchroms - as a means for the study of binary systems

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.290..607g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 290, Issue 4, pp. 607-616.

Astronomy and Astrophysics

Astronomy

6

Binaries: General, Stars: Chromospheres, Stars: Fundamental Parameters

Scientific paper

An independent method based on the concept of common chromospheres - roundchroms - is proposed for the determination of the radii of the main components of RS CVn-type close binary systems. The essence of the method is in the coincidence of the radius of the main component of the binary system with the equipotential zero-velocity surface for some values of the Jacobi constant. As an illustration, the method is applied to a sample of 15 RS CVn-type systems, and as a result the revised radii of the main components in the systems are determined. The main parameters, particularly the volumes, electron concentrations and masses of the roundchroms, are obtained as well. Empirical dependences of the electron concentration in the roundchrom, n_e, and of the 2800 Mg ii doublet luminosity, L(Mg ii), on intercomponent distance a were discovered, the first in the form n_e~a^-0.85 and the second in the form L(Mg ii)~a^1.66. The formation of a roundchrom in close binary systems is inevitable, and the roundchrom is as essential a physical formation for binary systems as are the corona and chromosphere for single stars.

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