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The proper and space motions of the globular cluster NGC 4147 on the Hipparcos system
DOI: 10.1016/S0275-1062(00)00027-8 Bibcode: 2000ChA&A..24...61W

Wang, Jia-ji; Wu, Zhen-yu

Dr M. Geffert, of Sternwarte der Universität Bonn, kindly provided us with the positions and proper motions of 82 stars in the field of the globular cluster NGC 4147, reduced with 11 reference stars from the Hipparcos catalogue. We used 54 of these stars to re-reduce the observations by Wang Jia-ji and Gupta [1]. Based on the new proper…

2000 • Chinese Astronomy and Astrophysics
Hipparcos 0
Proper motions of Hipparcos stars in two plate areas
DOI: 10.1016/S0275-1062(00)00050-3 Bibcode: 2000ChA&A..24..257W

Wang, Shu-he; Tang, Zheng-hong; Jin, Wen-jing

Using the ACT reference catalogue as preliminary reference we have reduced 31 exposures on 15 plates in two areas taken with the 40-cm refractor of our Observatory. Using the central overlapping technique and an iterative procedure we have derived high-precision positions and proper motions for 54 stars, including 16 Hipparcos stars. For the latte…

2000 • Chinese Astronomy and Astrophysics
Hipparcos 0