疏散星团NGC6530的成员研究和空间运动

On Membership of the Open Cluster NGC6530 and Its Space Motions from Proper Motion

利用上海天文台40厘米折射望远镜照相观测资料所得出的恒星自行,按最大似然原理确定了疏散星团NGC6530天区内恒星的成员概率．分析表明星团成员确定是非常有效的,成员概率p≥0．9的恒星计有250颗．最后,确定了星团的空间运动,并作了简单的讨论．

Using the stellar proper motions reduced from the observational data of photographic plates taken with the 40 cm double astrograph of Shanghai Astronomical Observatory, the distribution parameters and membership probabilities of stars in the region of the open cluster NGC6530 are determined on the basis of the maximum likelihood principle and given in tabular form. It is found from detailed discussion that the membership of the cluster is determinated very successfully. The number of member stars with probabilities larger than 0.9 is 249 and few stars are with medium probabilities. Finally, the space motion of the cluster is determined and discussed briefly.