Spectroscopic and photometric observations of the short-period RS CVn-type star CG Cyg*
Department of Physics, Shoumen University, 9700 Shoumen, Bulgaria and Isaac Newton Institute of Chile, Bulgarian Branch e-mail: firstname.lastname@example.org; email@example.com
2 Mt. Suhora Observatory of the Pedagogical University, ul. Podchorazych 2, 30-094 Cracow, Poland
Corresponding author: W. Ogloza, firstname.lastname@example.org
Accepted: 16 December 2002
Spectroscopic observations around the Hα line and BVR photometry of the eclipsing short-period RS CVn-star CG Cyg are presented. The solutions of the radial velocity curves and the light curves yielded the following masses and radii of the star components: , , , . The measured rotational broadenings of the observed lines correspond to equatorial velocities km s-1 and km s-1. The distortions of our multicolor light curve were reproduced by two cool spots on the primary star. The strong absorption feature between the spectral lines of the two stars was explained by extended structure around the mass center of the system. The Hα emission line of the secondary star in the August spectra was attributed to a prolonged flare of this star.
Key words: stars: activity / binaries: eclipsing / binaries: spectroscopic / stars: chromospheres / stars: individual: CG Cyg / stars: starspots
© ESO, 2003