中等年龄疏散星团NGC752中的QX And变星的测光研究

Photometric Studies of QX And in the Intermediate-age Open Cluster NGC 752

QX And变星是中等年龄疏散星团NGC 752中的一个短周期的W UMa类型的相接双星.在2007年9月10日到12月25日期间,利用国家天文台兴隆85cm反射式望远镜对QX And变星进行B和V测光研究.我们得到了B和V两个波段的光变曲线;利用K-W方法定出光变极小时刻;通过经典的O-C方法得到QX And变星的周期P=4.121 681 17d和周期变化率dp/dt=1.89×10-7d/a.

QX And is a short-period eclipsing binary with W UMa type in the imteumediate-age open cluster NGC 752. potometric oservations of QX And in B and V filters were carried out from Sep 18,2007 to Dec 25,2007 by the use of 85 cm reflector telescope at the Xinglong station of National Astronomical Observatory. Light curves in B an V filters were derived and Light minimuns were determined with the K-W method. Finally,based on the classical O-C method,the period and the rate of period were determined to be P =4. 12168117 day and dp/dt = 1.89 × 10^-7day/yr.