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

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

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

Received: 7 February 2003
Accepted: 11 September 2003

Abstract

High-resolution spectroscopic observations around the H_α 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: , , , . The measured rotational broadenings of the spectral lines correspond to equatorial velocities km s^-1 and 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_α 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.