球状星团NGC4147基于Hipparcos系统的绝对自行  

ABSOLUTE PROPER MOTION OF GLOBULAR CLUSTER NGC 4147 ON HIPPARCOS SYSTEM

作　　者：王家骥[1] 武振宇[1] 

机构地区：[1]中国科学院国家天文观测中心

出　　处：《中国科学院上海天文台年刊》2000年第21期41-47,共7页Annals Shanghai Astronomical Observatory Chinese Academy of Sciences

基　　金：国家自然科学基金;中国科学院天文委员会天体测量和天体力学学科组支持项目

摘　　要：以《Hipparcos星表》所体现的国际天球参考架作为基础 ,对球状星团NGC4 147天区 115颗恒星的绝对自行 ,用Bonn大学天文台M .Geffert博士通过私人通信友好提供的这一天区内 82颗恒星基于Hipparcos系统的位置和自行重新作了归算。成员概率根据新的自行重新作了估算。由此得出的星团平均自行为 (- 2 .0 8± 0 .4 8,- 3.0 7± 0 .4 6 )mas/a。一颗位于红巨星延长线上的原来不能肯定其成员性的恒星 ,现以高概率表明极其可能是成员星。此外 ,还讨论了这个星团在银河系内的空间运动。The absolute proper motions of 115 stars in the region of the globular cluster NGC 4147, based on the ICRF represented by the Hipparcos Catalogue, are found from the observations in Wang & Gupta (1998) and the positions and proper motions of 82 stars in this region on the Hipparcos system, given kindly by Dr. M. Geffert, Sternwarte der Universit a¨t Bonn, in a private communication. From the new proper motion values, membership probabilities of the 115 stars are re-estimated. The average proper motion for the cluster, (-2.08±0.48, -3.07±0.46), is obtained. A photometrically peculiar star located at the extended line of the RGB, pointed by Aurière & Lauzeral (1991) and not confirmed for its membership, is confirmed as a member of the cluster. The space motion of the cluster in the Milky Way is discussed. Acknowledgment The authors sincerely thank Dr. M. Geffert for his kindness.

关 键 词：球状星团 绝对自行 空间运动 归算 成员概率 国际天球参考架 

分 类 号：P154.12[天文地球—天文学]