Astron. Astrophys. Suppl. Ser.
Volume 146, Number 1, October I 2000
|Page(s)||7 - 12|
|Published online||15 October 2000|
Star-spots activity on BH Virginis
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
Accepted: 17 May 2000
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.
Key words: stars: eclipsing binaries / stars: star-spots
© European Southern Observatory (ESO), 2000