Astron. Astrophys. Suppl. Ser. 146, 251-258

Absolute proper motions of open clusters

I. Observational data

H. Baumgardt¹ - C. Dettbarn² - R. Wielen²

Send offprint request: H. Baumgardt

1 - Department of Mathematics and Statistics, University of Edinburgh, Edinburgh EH9 3JZ, UK
2 - Astronomisches Rechen-Institut Heidelberg, Mönchhofstraße 12-14, D-69120 Heidelberg, Germany
e-mail: holger@maths.ed.ac.uk

Received May 29; accepted July 17, 2000

Abstract:

Mean proper motions and parallaxes of 205 open clusters were determined from their member stars found in the Hipparcos Catalogue. 360 clusters were searched for possible members, excluding nearby clusters with distances D < 200 pc. Members were selected using ground based information (photometry, radial velocity, proper motion, distance from the cluster centre) and information provided by Hipparcos (proper motion, parallax). Altogether 630 certain and 100 possible members were found. A comparison of the Hipparcos parallaxes with photometric distances of open clusters shows good agreement. The Hipparcos data confirm or reject the membership of several Cepheids in the studied clusters.

Key words: Galaxy: open clusters and associations: general -- Astrometry -- stars: variables: Cepheids