A photometric study of BH Cas*
1
Astronomical Observatory of the Jagiellonian University, ul. Orla 171, 30-244 Cracow, Poland
2
Mt. Suhora Observatory of the Pedagogical University, ul. Podchorążych 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
Corresponding author: S. Zoła, sfzola@cyf-kr.edu.pl
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 (
). 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
© ESO, 2001