Star-spots activity on BH Virginis

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

Send offprint request to: F.Y. Xiang

Received: 2 May 1996
Accepted: 17 May 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 , 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 . (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.