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Improvement of proper motions for Hipparcos stars with photographic plates.

Wang, Jia-Ji; Tang, Zheng-Hong; Wang, Shu-He +1 more

Using the PPM catalogue as a preliminary reference catalogue, the authors have reduced 17 exposures on 9 plates taken with the 40 cm refractor at Zo-Sè Station of Shanghai Astronomical Observatory in about 30 years. By means of the central overlapping technique and the iterative process, high-precision positions and proper motions of 28 PPM stars,…