河外星系NGC7302周围依巴谷星的精确位置和自行  

HIGH-PRECISION POSITIONS AND PROPER MOTIONS OF SOME HIPPARCOS STARS AROUND NGC7302

作　　者：唐正宏[1] 王叔和[1] 王家骥[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》1998年第19期35-39,共5页Annals Shanghai Astronomical Observatory Chinese Academy of Sciences

基　　金：国家自然科学基金

摘　　要：采用上海天文台佘山40cm折射望远镜所拍摄的6张底片，以PPM星表作为初始参考星表，按中心重叠法进行了归算，得到河外星系NGC7302的位置与自行，以及周围天区11颗星的高精度位置和自行，它们的标准误差均好于30mas和0．7mas／a。其中有4颗是依巴谷星，它们的赤经和赤纬自行精度的平均值分别为0．024ms／a和0．21mas／a。Six exposures on 6 plates of the epoch differences up to 31 years, which were taken with the 40cm astrographic refractor at Sheshan station of Shanghai Astronomical observatory,were reduced. Taking the PPM catalogue as the initial reference catalogue and using the central overlapping method with the iteration process, we obtained the position and 'proper motion' of NGC7302 and high - precision positions and proper motions of 11 stars around the galaxy. The standard errors of positions are better than 30mas, and the standard errors of proper motions are better than 0. 7mas/a. There are 4 Hipparcos stars among the 11 stars.The mean internal errors of proper motions of them in right ascension and declination are 0. 024ms/a and 0. 21mas/a, respectively.

关 键 词：照相天体测量 依巴谷星 位置 自行 河外星系 中心重叠法 PPM星表 观测精度 

分 类 号：P157[天文地球—天文学] P123