SCYON Abstract

Received on July 9 2001

Proper motions of open clusters within 1 kpc based on the TYCHO 2 Catalogue

AuthorsW. S. Dias, J. R. D. Lépine and B. S. Alessi
AffiliationUniversidade de São Paulo, Dept. de Astronomia, CP 3386, São Paulo 01060-970, Brazil
Submitted toAstronomy & Astrophysics or


We present mean absolute proper motions of 132 open clusters, determined using the data from the Tycho 2 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 168 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).