CCD photometric study of the W UMa-type binary II CMa in the field of Berkeley 33

Details CCD photometric study of the W UMa-type binary II CMa in the field of Berkeley 33 CCD photometric study of the W UMa-type binary II CMa in the field of Berkeley 33

2011-03-10

arxiv.org/abs/1103.2031v1

PASJ: Publ. Astron. Soc. Japan 60, 565-570, 2008 June 25

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Scientific paper

The CCD photometric data of the EW-type binary, II CMa, which is a contact star in the field of the middle-aged open cluster Berkeley 33, are presented. The complete R light curve was obtained. In the present paper, using the five CCD epochs of light minimum (three of them are calculated from Mazur et al. (1993)'s data and two from our new data), the orbital period P was revised to 0.22919704 days. The complete R light curve was analyzed by using the 2003 version of W-D (Wilson-Devinney) program. It is found that this is a contact system with a mass ratio $q=0.9$ and a contact factor $f=4.1%$. The high mass ratio ($q=0.9$) and the low contact factor ($f=4.1%$) indicate that the system just evolved into the marginal contact stage.

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