Astron. Astrophys. Suppl. Ser. 146, 7-12

Star-spots activity on BH Virginis

F.Y. Xiang¹ - S.F. Deng¹ - Q.Y. Liu²

Send offprint request: F.Y. Xiang

1 - Physics Department of Xiangtan University, Xiangtan, Hunan, P.R.C. 411105, PR China
2 - Yunnan observatory, Chinese Academy of Sciences, Kunming, Yunnan, PR China

Received May 2, 1996; accepted May 17, 2000

Abstract:

BH Virginis is a short-period RS CVn system. From our observations and archival sources we have gained an ephemeris by means of the times of minima. The light curves and the photoelectric observations in B and V obtained by Koch (1967) have been analyzed by using the Wilson-Devinney program. The principal results are as follows: (1) The mass ratio obtained from the photoelectric light curves is q = m₂/m₁=0.967, close to the spectroscopic value 0.968 obtained by Zhai et al. (1990). (2) The photospheric temperature of the primary, T₁, at two epochs (1963-1964 and 1991) was about $5945~{\rm K}-6010~{\rm K}$. (3) Several spotted active regions are revealed on both components in 1963-1964 data sets, while only one small spotted active region appears on the secondary star in 1991.

Key words: stars: eclipsing binaries -- stars: star-spots