next previous
Up: Abstract

A&A Supplement Ser., Vol. 124, September 1997, 499-508

Received September 12; accepted December 6, 1996

Absolute parameters for binary systems

I. The active binary BH Virginis

R. Clementtex2html_wrap1225 - V. Reglerotex2html_wrap1225 - M. Garciatex2html_wrap1229 - J. Fabregattex2html_wrap1225 - J. Susotex2html_wrap1225

Send offprint request: R. Clement

tex2html_wrap1235  Departamento de Astronomıa y Astrofısica, Universidad de Valencia, Dr Moliner 50, E-46100, Burjassot, Valencia, Spain
tex2html_wrap1237  Departamento de Fısica Aplicada, E.U.I. Industrial, Universidad Politécnica de Madrid, Ronda de Valencia 3, E-28012 Madrid, Spain


New high-quality light curves of the late-type binary system BH Vir have been obtained during a 6 year photometric uvby and tex2html_wrap_inline1211 monitoring program of low mass eclipsing binaries (Clement et al. 1997), hereafter Papers I and II.

This paper presents detailed analysis of this binary based on the four light curves obtained within our program. The activity wave superimposed on the eclipse-modulated light curves has been adjusted and removed by using a new iterative application of the standard EBOP code together with truncated Fourier Series fittings. Combining the recent radial velocity curves (Popper 1995) with the geometrical elements deduced from the "clean" photometric light curves, the absolute parameters of the system are calculated. BH Vir appears as a binary composed by two main sequence G0 and G2 stars with solar chemical composition lying on the same isochrone (tex2html_wrap_inline1213 years).

The accuracy obtained on the absolute parameters determination allows us to include BH Vir on the select group of late-type stars to be used on the estimation of the Mass-Luminosity-Relationship.

keywords: stars: binaries: eclipsing -- stars: late-type -- stars: activity -- stars: fundamental parameters -- stars: individual: BH Vir -- stars: evolution

Copyright by the European Southern Observatory (ESO)