EDP Sciences
Free access
Volume 433, Number 1, April I 2005
Page(s) 143 - 150
Section Galactic structure, stellar clusters and populations
DOI http://dx.doi.org/10.1051/0004-6361:20042044

A&A 433, 143-150 (2005)
DOI: 10.1051/0004-6361:20042044

Probing the nature of possible open cluster remnants with the Southern Proper Motion Program

G. Carraro1, 2, 3, D. I. Dinescu2, T. M. Girard2 and W. F. van Altena2

1  Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
    e-mail: gcarraro@das.uchile.cl
2  Astronomy Department, Yale University, PO Box 208101, New Haven, CT 06520-8101, USA
3  Dipartimento di Astronomia, Università di Padova, Vicolo Osservatorio 2, 35122 Padova, Italy

(Received 21 September 2004 / Accepted 29 November 2004)

We discuss the nature of eleven Possible Open Cluster Remnants (POCRs) by using absolute proper motions from the Southern Proper Motion (SPM) Program 3 (Girard et al. 2004, AJ, 127, 3060) combined with near infrared photometry from 2MASS. The analysis is done by considering the distribution of stars in the Color-Magnitude and the Vector Point diagrams. We successfully probed the capabilities of the SPM catalog to detect a physical group by looking at the open cluster Blanco 1. However, within the uncertainties of the SPM3 catalog and basing on 2MASS photometry we conclude that only one - ESO 282SC26 - out of eleven objects turns out to be a probable physical group. We suggest it is an open cluster 1.3 Gyr old and located 1.4 kpc from the Sun.

Key words: open clusters and associations : general -- astrometry

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