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

D. P. Kjurkchieva; D. V. Marchev; W. Ogloza

doi:10.1051/0004-6361:20030040

Home

All issues

Volume 400 / No 2 (March III 2003)

A&A, 400 2 (2003) 623-631

Abstract

Free Access

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

A&A 400, 623-631 (2003)

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

D. P. Kjurkchieva¹, D. V. Marchev¹ and W. Ogloza²

¹ Department of Physics, Shoumen University, 9700 Shoumen, Bulgaria and Isaac Newton Institute of Chile, Bulgarian Branch e-mail: d.kyurkchieva@shu-bg.net; d.marchev@shu-bg.net
² Mt. Suhora Observatory of the Pedagogical University, ul. Podchorazych 2, 30-094 Cracow, Poland

Corresponding author: W. Ogloza, ogloza@ap.krakow.pl

Received: 11 October 2002
Accepted: 16 December 2002

Abstract

Spectroscopic observations around the H_α 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: $M_{\rm 1}=0.97~ M_{\odot}$ , $M_{\rm 2}=0.80~M_{\odot}$ , $R_{\rm 1}=1.00 ~R_{\odot}$ , $R_{\rm 2}=0.83 ~R_{\odot}$ . The measured rotational broadenings of the observed lines correspond to equatorial velocities $V_{\rm 1}=80$ km s^-1 and $V_{\rm 2}=66$ 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 H_α 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

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.

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^*