疏散星团NGC2548天区恒星的绝对自行测定  

MEASUREMENTS OF THE ABSOLUTE PROPER MOTIONS FOR STARS IN THE FIEID OF OPEN CLUSTER NGC2548

作　　者：武振宇[1] 

机构地区：[1]中国科学院上海天文台,上海200030

出　　处：《中国科学院上海天文台年刊》2001年第1期75-79,共5页Annals Shanghai Astronomical Observatory Chinese Academy of Sciences

摘　　要：使用上海天文台 4 0cm口径双筒折射望远镜拍摄的疏散星团NGC2 5 48的 10张底片 ,测定了该星团天区内 5 0 1颗恒星相对于Tycho - 2星表 2 65颗星表星的绝对自行。并根据含有 9个参数的星团成员概率判定模型 ,对以上的 5 0 1颗恒星进行了成员概率的计算。若以成员概率大于 0 .7的恒星作为团星的判定标准 ,则在 5 0 1颗恒星中有 165颗属于团星。plates were taken with 40cm refractor at Sheshan Station of Shanghai Astronomical Observatory, spanning epoch of up to 82 years. The positions and absolute proper motions of 265 stars in Tycho-2 catalogue are used as the reference frame. Absolute proper motions for 501 stars in the field of open cluster NGC2548 covered by plates derived, and the membership probabilities of the stars are determined. If stars with membership probability bigger than 0.7 are cluster stars, 165 stars are found to be probable members of NGC2548.

关 键 词：疏散星团NGC2548 绝对自行 成员判定 

分 类 号：P15[天文地球—天文学]