EDP Sciences
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Volume 415, Number 1, February III 2004
Page(s) 231 - 239
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20031651

A&A 415, 231-239 (2004)
DOI: 10.1051/0004-6361:20031651

Spectroscopic and photometric observations of the short-period RS CVn-type star WY Cnc

D. Kjurkchieva1, D. 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
    e-mail: d.marchev@shu-bg.net
2  Pedagogical University, ul. Podchorazych 2, 30-084 Cracow and Mt. Suhora Observatory, Poland
    e-mail: ogloza@ap.krakow.pl

(Received 7 February 2003 / Accepted 11 September 2003 )

High-resolution spectroscopic observations around the H $_{\alpha}$ line and BVRI photometry of the eclipsing short-period RS CVn star WY Cnc are presented. The solutions of our radial velocity curves and light curves yielded the following values for masses and radii of the components: $M_{\rm 1}=0.84$ $M_{\odot}$, $M_{\rm 2}=0.46$ $M_{\odot}$, $R_{\rm 1}=1.06$ $R_{\odot}$, $R_{\rm 2}=0.65$ $R_{\odot}$. The measured rotational broadenings of the spectral lines correspond to equatorial velocities $V_{\rm 1}=78$ km s -1 and $V_{\rm 2}=49$ km s -1. The distortions of our multicolor light curve of WY Cnc were reproduced by two cool spots on the primary star. An increase of the out-of-eclipse brightness by 0.1 mag in February 2001 was detected. Our spectra show H $_{\alpha}$ line in emission from the secondary star. The chromospheric activity appeared also in the observed emission cores of the CaII H and K lines as well as the CaI 6494 line.

Key words: stars: activity -- binaries: eclipsing -- binaries: spectroscopic -- stars: chromospheres -- stars: individual: WY Cnc -- stars: starspots

Offprint request: W. Ogloza, ogloza@ap.krakow.pl

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