Absolute stellar proper motions with reference to galaxies of the M 81 group
| Autor: | P. Brosche, M. Odenkirchen, R. Ziener, H. Meusinger, F. Börngen |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Astronomy and Astrophysics Supplement Series. 124:189-196 |
| ISSN: | 1286-4846 0365-0138 |
| DOI: | 10.1051/aas:1997189 |
| Popis: | We report on the measurement of absolute proper motions of stars of magnitude 7 to 14.5 in a 22 eld in the region of the M 81 group of galaxies. This work is part of the Bonn program for the extragalactic link of Hipparcos. The proper motions were determined from a collection of photographic plates covering the time interval from 1894 to 1994. The absolute reference system for the proper motions is represented by the galaxies M 81, M 82 and NGC 3077, for which accurate optical reference posi- tions were obtained by means of an image cross-correlation technique. For the majority of stars, the internal proper motion accuracy is better than 1 mas/a. The precision of the realization of the absolute system is found to be around 1 mas/a. In total, our measurements yield abso- lute proper motions for 24 Hipparcos stars and positions, proper motions and photometry for 330 additional stars including a number of visual binaries and high proper mo- tion stars. Among the latter one G-type subdwarf is iden- tied. The results are relevant as a contribution to the Hipparcos link, but also as a database for kinematic in- vestigations. |
| Databáze: | OpenAIRE |
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