SCYON Abstract

Received on March 8 2001

Proper motions of Southern open clusters within 1 kpc based on the UCAC1 Catalog

AuthorsW. S. Dias, J. R. D. Lépine, B. S. Alessi
AffiliationInstituto Astronómico e Geofísico, Universidade de São Paulo, Caixa Postal 3386, 01060-970 São Paulo SP, Brazil
Submitted toAstronomical Journal


We present mean absolute proper motions of 48 southern open clusters, determined using the data from the First U. S. Naval Observatory CCD Astrograph Catalog (UCAC1). For 9 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 48 open clusters is 16875, of which 2930 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).