Free access article

A&A 388, 168-171 (2002)
DOI: 10.1051/0004-6361:20020417

Proper motions of open clusters based on the TYCHO2 Catalogue

II. Clusters farther than 1 kpc

W. S. Dias, J. R. D. Lépine and B. S. Alessi

Universidade de São Paulo, Dept. de Astronomia, CP 3386, São Paulo 01060-970, Brazil

(Received 26 February 2002 / Accepted 19 March 2002 )

Abstract
We determined the mean absolute proper motion of 94 open clusters situated farther than 1 kpc from the Sun. The results are derived from the stellar proper motion data given in the Tycho2 Catalogue. The mean proper motion of the clusters and membership probability of individual stars were obtained from the proper motion data by applying the statistical method proposed by Sanders (1971). The measurements made use of a large number of stars, usually several tens, for each cluster. The total number of stars investigated in the fields of the clusters is 4864 of which 2021 were considered members. For 55 clusters, this is the first determination of the proper motion.

Key words: Galaxy: open clusters and association: general

Offprint request: W. S. Dias, wilton@iagusp.usp.br

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© ESO 2002

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