Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasj...56..469x&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.56, No.3, pp. 469-474
Astronomy and Astrophysics
Astronomy
3
Stars: Activity, Stars: Eclipsing Binaries, Stars: Individual (Bh Virginis), Stars: Star-Spots
Scientific paper
BH Virginis is a short-period eclipsing binary with two solar-type components. The photoelectric light curves in UBVRI, observed by Scaltriti et al. (1985), and in the B and 5125Å bands, observed by Hoffmann (1982), were analyzed by using the 1992 version Wilson-Devinney program to investigate the activity of spots. The results show that there was a small cool spotted active region on the secondary star in 1984. The position and area of the active region in 1984 are remarkably similar to those in 1991. The distortion waves in the light curves observed by Hoffmann (1982) can be fitted satisfactorily with two hot-spot active regions: one is on the primary star, and the other is on the secondary component. The mass ratio q = m2 / m1, obtained from photoelectric light curves, is inside the range of 0.965-0.971. It is close to the spectroscopic value of 0.968 obtained by Zhai et al. (1990). To study the physical cause of the variations and the distortions in the light curve of BH Vir, the photoelectric observations in BV observed by Koch (1967) were re-analyzed based on a new spot model with an assumption of one cool spot active region on the primary star and two cool spot active regions on the secondary star. The fit of the new spot model to the observations is better than that of our former result (Xiang et al. 2000). The present results suggest that BH Vir may have an active cycle with a period of 7-10 years.
Xiang Fu Yuan
Zhou Yi Chun
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