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Analysis of USNO-B1 proper motions of stars in open-cluster fields

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USNO-B1 proper motions for stars in the fields of NGC 457 and ? and h Per open clusters are analyzed and compared to the the proper motions based on plate material taken with normal astrographs. USNO-B1 proper motions in central regions of clusters are found to have large errors due mostly to numerous misidentifications in crowded fields. At the same time, USNO-B1 proper motions for the rest of cluster stars proved to compare fairly well to those inferred in classical astrometric studies. Standard deviations of the proper-motion differences between USNO-B1 and cluster proper-motion studies are found to be on the order of 3.4–4.2 mas yr -1 .
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Keywords: astrometry; open clusters; proper motions

Document Type: Research Article

Affiliations: Astronomical Institute, Academy of Sciences of Uzbekistan, Astronomicheskaya st. 33, Tashkent, 700052, Uzbekistan

Publication date: 2005-06-01

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