Spectroscopic and photometric observations of the short-period RS CVn-type star BH Virginis *,**,***
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: firstname.lastname@example.org
Accepted: 11 May 2004
High-resolution spectroscopic observations around the Hα 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: 1.173 ± 0.006 ; 1.046 ± 0.005 ; 1.22 ± 0.05 ; 1.11 ± 0.04 ; 87.5° ± 0.8°. The measured rotational broadening of the spectral lines corresponds to equatorial velocities V1 = 79.8 km s-1 and 68.4 km s-1. Our data reveal considerable Hα 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
Based on spectral observations collected at the National Astronomical Observatory at Rozhen and photometric observations collected at Mt. Laguna Observatory operated by San Diego State University, research was supported in part by the NATO Linkage grant No. PST.CLG.978810, grant No. 8/2003 of the Shoumen University, a Cottrell College Science Award of the Research Corporation, and grants from NASA and the Gaposchkin Fund administered by the AAS Small Grants Program.
Photometric and spectroscopic data are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (220.127.116.11) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/424/993
© ESO, 2004