Variable stars in the field of the globular cluster NGC 3201

被引:18
|
作者
von Braun, K [1 ]
Mateo, M [1 ]
机构
[1] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA
来源
ASTRONOMICAL JOURNAL | 2002年 / 123卷 / 01期
关键词
binaries : eclipsing; blue stragglers; color-magnitude diagrams; dust; extinction; globular clusters : individual (NGC 3201); stars : variables : general;
D O I
10.1086/324641
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report on the discovery and analysis of 14 short-period variable stars in the field of the southern globular cluster NGC 3201, located within roughly 2 mag on either side of the main-sequence turnoff. Eleven of these variable stars are eclipsing binaries, one is an RR Lyrae, and two are thus far unclassified systems. Among the eclipsing binary stars, nine are of the W Ursae Majoris (W UMa) type, one an Algol (EA) system, and one a detached system. Using spectroscopic follow-up observations, as well as analysis of the variables locations in the color-magnitude diagram of the cluster, we find that only one variable star (a W UMa type blue straggler) is actually a member of NGC 3201. We present the phased photometry light curves for all the variable star systems, as well as their locations in the field of view and in the color-magnitude diagram.
引用
收藏
页码:279 / 289
页数:11
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