疏散星团NGC2099中新发现的3颗食双星  

Three New EA-type Eclipsing Binaries in the Open Cluster NGC2099

作　　者：曹彪[1] 罗志全[1] 王坤[1] 

机构地区：[1]西华师范大学理论物理研究所,四川南充637009

出　　处：《西华师范大学学报（自然科学版）》2013年第1期40-44,共5页Journal of China West Normal University(Natural Sciences)

摘　　要：为了研究星团变星族,我们对疏散星团NGC2099进行了时序的CCD测光观测.在星团场中,发现了3颗新的EA型食双星,其中一颗星是脉动的食双星.利用相位弥散最小方法,确定了它们的光变周期并给出了它们的光变曲线.根据自行和颜色星等图中的位置,我们确定这颗脉动的食双星很可能是星团成员星.To investigate variable stars in open clusters, we carried out a time-series CCD photometry of the open cluster NGC2099. Three new EA-type eclipsing binaries have been discovered in the field of this cluster, and one of them was an eclipsing binary with a pulsating component. With the phase dispersion minimization algorithm method, periods of their light curves were determined and their light curves are derived. Based on the proper motion and location in the color-magnitude diagram, we concluded that this newly discovered eclipsing binary with a pulsating was very likely to be the member of the cluster.

关 键 词：疏散星团 食双星 自行 颜色星等图 

分 类 号：P154[天文地球—天文学]