SIMBAD references

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 (1967AJ.....72..411K) 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. (1990A&A...237..148Z). (2) The photospheric temperature of the primary, T₁, at two epochs (1963-1964 and 1991) was about 5945K-6010K. (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.