球状星团M3的绝对自行测定及其空间运动  

MEASUREMENTS OF THE ABSOLUTE PROPER MOTIONS OF M3 AND ITS SPACE MOTION

作　　者：武振宇[1] 王家骥[1,2] 

机构地区：[1]中国科学院上海天文台,上海200030 [2]中国科学院光学天文联合开放实验室

出　　处：《天文学报》2000年第2期163-171,共9页Acta Astronomica Sinica

基　　金：国家自然科学基金;中国科学院天文委员会天测天力分支学科支持项目

摘　　要：使用上海天文台佘山 40厘米折射望远镜拍摄的两期共 1 4张球状星团M3底片的PDS扫描结果 ,以ACT星表中的 2 4颗恒星的位置和绝对自行为参考架 ,用中心重叠法进行天体测量归算 ,得到了这个星团中心附近 1°.5× 1°.5天区内 534颗恒星的位置和绝对自行 ,并利用这些自行对成员概率进行估算 ,得到这个星团的赤经方向绝对自行为 - 0 .3± 0 .3mas/yr,赤纬方向绝对自行为 - 3.1± 0 .3mas/yr.使用该自行值 ,结合已知的M3的距离和视向速度 。plates taken with the 40 cm refractor at Sheshan Station of Shanghai Observatory are used. The spanning epoch is about 80 years. The positions and absolute proper motions of 24 stars in ACT catalogue are used as the reference frame. The reduction was made with the central overlapping principle. The absolute proper motions of 534 stars in the region of about 1°.5×1°.5 around the cluster M3 are measured. With the new data of proper motions, the membership probabilities of stars are determined. The average absolute proper motion for the cluster of -0.3±0.3 mas/yr in R.A. and -3.1±0.3 mas/yr in Dec. is obtained. By combining the authors' results with the known distance and radial velocity of the cluster, its Galactic orbits in given three component Galactic potentials are also obtained.

关 键 词：球状星团 绝对自行 轨道 空间运动 

分 类 号：P154[天文地球—天文学] P157.8