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Issue A&A
Volume 424, Number 3, September IV 2004
Page(s) 993 - 1002
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20035902



A&A 424, 993-1002 (2004)
DOI: 10.1051/0004-6361:20035902

Spectroscopic and photometric observations of the short-period RS CVn-type star BH Virginis

D. P. Kjurkchieva1, D. V. Marchev1, P. A. Heckert2 and C. A. Shower2

1  Department of Physics, Shoumen University, 9700 Shoumen, Bulgaria
    e-mail: [d.kyurkchieva;d.marchev]@shu-bg.net
2  Department of Chemistry and Physics, Western Carolina University, Cullowhee, NC, 28723, USA
    e-mail: heckert@wcu.edu

(Received 18 December 2003 / Accepted 11 May 2004)

Abstract
High-resolution spectroscopic observations around the H $_{\alpha}$ line and BVRI photometry from 1993 to 2003 of the eclipsing short-period RS CVn star BH Vir are presented. The simultaneous solution of our radial velocity curves and light curves yielded the following values for global parameters of the components: M1= 1.173  $\pm$ 0.006  $M_{\odot}$; M2= 1.046  $\pm$ 0.005  $M_{\odot}$; R1= 1.22  $\pm$ 0.05  $R_{\odot}$; R2= 1.11  $\pm$ 0.04  $R_{\odot}$; i= 87.5 $^{\circ}$  $\pm$ 0.8 $^{\circ}$. The measured rotational broadening of the spectral lines corresponds to equatorial velocities V1  = 79.8 km s -1 and V2= 68.4 km s -1. Our data reveal considerable H $_{\alpha}$ emission excess of the two stellar components. We modelled the photometric data to find the size and location of the starspots for each year. The established decreasing trend of the spot latitudes may indicate a latitudinal cycle of at least a decade.


Key words: stars: activity -- stars: binaries: eclipsing -- stars: binaries: spectroscopic -- stars: individual: BH Vir -- stars: starspots -- stars: chromospheres

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