EDP Sciences
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Volume 374, Number 1, July IV 2001
Page(s) 164 - 170
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010677

A&A 374, 164-170 (2001)
DOI: 10.1051/0004-6361:20010677

A photometric study of BH Cas

S. Zola1, 2, P. Niarchos3, V. Manimanis3 and A. Dapergolas4

1  Astronomical Observatory of the Jagiellonian University, ul. Orla 171, 30-244 Cracow, Poland
2  Mt. Suhora Observatory of the Pedagogical University, ul. Podchorazych 2, 30-084 Cracow, Poland
3  Department of Astrophysics, Astronomy and Mechanics, Faculty of Physics, University of Athens, Panepistimiopolis, 15784 Zografos, Athens, Greece
4  Institute of Astronomy and Astrophysics, National Observatory of Athens, 15236, Palaia Penteli, Athens, Greece

(Received 4 April 2000 / Accepted 8 May 2001)

New CCD observations of the contact binary system BH Cas are presented in this paper. New times of minima and an ephemeris based on our observations are also given. Complete light curves obtained in the V, R and I filters have been analyzed with the Wilson-Devinney code to derive the geometrical and physical parameters of the system. The final solution leads to a contact configuration ( $f \approx 21{-}22\%$). We have found that the photometric mass ratio differs from the spectroscopic one by about 13% , a discrepancy which is not uncommon for other W UMa systems. The absolute elements of the system are used to study its evolutionary status. The results show that BH Cas is a fairly evolved W-type W UMa system.

Key words: binaries: eclipsing BH Cas

Offprint request: S. Zola, sfzola@cyf-kr.edu.pl

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