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Direct demodulation image reconstruction of ME/EXOSAT Galactic Plane Survey.
Lu, Fangjun; Wu, Mei; Li, Tibei +1 more
The authors have reanalyzed the ME/EXOSAT Galactic Plane scan observational data with direct demodulation technique. They have studied the discrete X-ray sources in the regions which were unresolved in previous analyses. Using the bootstrap method, they have analyzed the statistical accuracy of the results and determined the position and flux erro…
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,…