Spectroscopic and photometric observations of the short-period RS CVn-type star CG Cyg

Details Spectroscopic and photometric observations of the short-period RS CVn-type star CG Cyg Spectroscopic and photometric observations of the short-period RS CVn-type star CG Cyg

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...400..623k&link_type=abstract

Astronomy and Astrophysics, v.400, p.623-631 (2003)

Astronomy and Astrophysics

Astrophysics

18

Stars: Activity, Binaries: Eclipsing, Binaries: Spectroscopic, Stars: Chromospheres, Stars: Individual: Cg Cyg, Stars: Starspots

Scientific paper

Spectroscopic observations around the Halpha 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: M1=0.97 Msun, M2=0.80 Msun, R1=1.00 Rsun, R2=0.83 Rsun. The measured rotational broadenings of the observed lines correspond to equatorial velocities V1=80 km s-1 and V2=66 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 Halpha emission line of the secondary star in the August spectra was attributed to a prolonged flare of this star.
Based on spectral observations at the 2-m Rozhen telescope, operated by the National Astronomical Observatory; the research was supported in part by grants of project No. 1/2002 of Shoumen University.

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