两个底片天区的依巴谷星自行

PROPER MOTIONS OF HIPPARCOS STARS IN TWO PLATE AREAS

利用上海天文台佘山４０ 厘米折射望远镜拍摄的２ 个底片天区１５ 张照相底片上的３１ 次观测，以ＡＣＴ 星表作为初始参考星表，按中心重叠法进行归算处理，得到了１６ 颗依巴谷星和３８ 颗场星的高精度位置和自行结果，其中依巴谷星的赤经和赤纬标准误差的平均值分别为１０ ．５ ｍａｓ 和７ ．５ ｍａｓ，赤经自行和赤纬自行标准误差的平均值分别为０ ．７０ ｍａｓ／ｙｒ 和０ ．５９

By using the ACT Reference Catalogue as a preliminary reference catalogue, the authors have reduced 31 exposures on 15 plates in areas of two plates taken with the 40 cm refractor at She Shan Station of Shanghai Astronomical Observatory. By means of the central overlapping technique and the iterative process, the highly precise positions and proper motions of 54 stars, including 16 Hipparcos stars in the two plate areas are obtained. The mean values of the internal standard errors of proper motions in right ascension and declination for the 16 Hipparcos stars are 0.70 mas/yr and 0.59 mas/yr, respectively. The mean values of the internal standard errors of their positions are 10.5 mas and 7.5 mas in right ascension and declination, respectively.