SCYON Abstract

Received on March 18 2002

Proper motions of open clusters within 1kpc based on the TYCHO2 Catalogue

Authors	W.S. Dias, J.R.D. Lépine and B.S. Alessi
Affiliation	Instituto Astronômico e Geofísico, Universidade de São Paulo, Caixa Postal 386, 01060-970 São Paulo SP, Brazil
Submitted to	Astronomy & Astrophysics
Contact	wilton@iagusp.usp.br or wiltonsdias@yahoo.com.br
URL	http://www.iagusp.usp.br/~wilton/
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Abstract

We present mean absolute proper motions of 112 open clusters, determined using the data from the Tycho2 Catalogue. For 28 clusters, this is the first determination of proper motion. The measurements made use of large number of stars (usually several tens) for each cluster. The total number of stars studied in the fields of the 164 open clusters is 5016, of which 4006 were considered members. The mean proper motions 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).