球状星团的天体测量(英)

Astrometry of Globular Clusters

球状星团是银河系中最年老的天体之一，是储存着银河系早期演化珍贵信息的“化石”．球状星团的天体测量，主要包括球状星因天区内恒星相对自行的测定，并由这些相对自行数据采用适当方法定出星团的绝对自行，或者直接测定绝对自行．利用这些自行数据，或者进一步与测光和视向速度数据结合，可以开展与球状星团的距离、运动、动力学状况、质量、年龄、演化等等以及银河系的结构和演化等有关的一系列重要的研究．在本文中对本世纪70年代中期以来在球状星团相对自行测定和成员概率估计、内部运动检测、绝对自行测定和空间运动研究这三方面取得的成果和进展以及存在的问题作了评述．

The globular clusters are of the oldest objects in the Mica Way and 'fossils' storedwith valuable meessages of the formation and evolution of the Gala In astrometry of a globular cluster, relstive proper motions of stazs in region Of the cluster are determined and absolute proper motion of the cluSter can be derived from relative motions by an appropriateprocess, or determilled directly. These motion data, or further, combined with radial velocityand photometric data, enable the important information of distance, SPace motion, dynamics,mass, age, evolution, etc. of the globular cluster and of structure and evolution of the Galaxyto be investigated. The results, Progress, and open questions in respects of the determination of relative proper motions, the estimation of membership probabilities, thedetection of internal motions, the determination of absolute proper motions, and theinvestigation of space motions of the globular clusters since the ndddie of 1970's arereviewed.