Absolute stellar proper motions with reference to galaxies of the M81 group

Details Absolute stellar proper motions with reference to galaxies of the M81 group Absolute stellar proper motions with reference to galaxies of the M81 group

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..124..189o&link_type=abstract

A & A Supplement series, Vol. 124, July 1997, 189-196.

Astronomy and Astrophysics

Astronomy

3

Galaxies: M81, Astrometry, Reference Systems, Catalogs

Scientific paper

We report on the measurement of absolute proper motions of stars of magnitude 7 to 14.5 in a 2 deg X 2 deg field in the region of the M81 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 M81, M81, and NGC3077, for which accurate optical reference positions 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 absolute 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 motion stars. Among the latter one G-type sub-dwarf is identified. The results are relevant as a contribution to the Hipparcos link, but also as a database for kinematic investigations.

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