| Issue |
A&A
Volume 400, Number 2, March III 2003
|
|
|---|---|---|
| Page(s) | 623 - 631 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20030040 | |
| Published online | 03 March 2003 | |
Spectroscopic and photometric observations of the short-period RS CVn-type star CG Cyg*
1
Department of Physics, Shoumen University, 9700 Shoumen, Bulgaria and Isaac Newton Institute of Chile, Bulgarian Branch e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
; This email address is being protected from spambots. You need JavaScript enabled to view it.
2
Mt. Suhora Observatory of the Pedagogical University, ul. Podchorazych 2, 30-094 Cracow, Poland
Corresponding author: W. Ogloza, This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
11
October
2002
Accepted:
16
December
2002
Abstract
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
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.
© ESO, 2003
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