CCD photometric study of the WUMa-type binary II Canis Majoris in the field of Berkeley 33

被引：7
|
作者：
Liu, Liang [1 ,2 ,3 ]
Qian, Sheng-Bang [1 ,2 ]
Zhu, Li-Ying [1 ,2 ,3 ]
He, Jia-Jia [1 ,2 ,3 ]
Yuan, Jinzhao [1 ,2 ,3 ]
Dai, Zhibin [1 ,2 ,3 ]
Liao, Wenping [1 ,2 ,3 ]
Zhang, Jia [1 ,2 ,3 ]
机构：
[1] Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China
[2] Chinese Acad Sci ULOAC, United Lab Opt Astron, Beijing 100012, Peoples R China
[3] Chinese Acad Sci, Grad Sch, Beijing 100012, Peoples R China
来源：
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2008年 / 60卷 / 03期
关键词：
stars : binaries : close; stars : binaries : eclipsing; stars : evolution; stars : individual (II Canis Majoris);
D O I：
10.1093/pasj/60.3.565
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The CCD photometric data of an EW-type binary, II CMa, 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.
引用
收藏
页码：565 / 569
页数：5
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    National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming
    650011, China
    不详
    100012, China
    不详
    100012, China
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