CCD Photometric Study of the W UMa-Type Binary II Canis Majoris in the Field of Berkeley 33

The CCD photometric data of an EW-type binary, IICMa, which is a contact star in the field of the middle-aged open cluster Berkeley 33, are presented. A complete $R$ light curve was obtained. In the present work, using the five CCD epochs of light minimum [three of them were calculated from Mazur et...

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Published in:Publications of the Astronomical Society of Japan 2008-06, Vol.60 (3), p.565-569
Main Authors: Liu, Liang, Qian, Sheng-Bang, Zhu, Li-Ying, He, Jia-Jia, Yuan, Jinzhao, Dai, Zhibin, Liao, Wenping, Zhang, Jia
Format: Article
Language:English
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Summary:The CCD photometric data of an EW-type binary, IICMa, which is a contact star in the field of the middle-aged open cluster Berkeley 33, are presented. A complete $R$ light curve was obtained. In the present work, using the five CCD epochs of light minimum [three of them were calculated from Mazur et al. (1993 MNRAS, 265, 405)’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 of $q=0.9$ and a contact factor of $f=4.1$ %. 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.
ISSN:0004-6264
2053-051X
DOI:10.1093/pasj/60.3.565