paper

Towards absolute scales of radii and masses of open clusters

arXiv:astro-ph/0702517 · doi:10.1051/0004-6361:20077073

Abstract

Aims: In this paper we derive tidal radii and masses of open clusters in the nearest kiloparsecs around the Sun. Methods: For each cluster, the mass is estimated from tidal radii determined from a fitting of three-parametric King's profiles to the observed integrated density distribution. Different samples of members are investigated. Results: For 236 open clusters, all contained in the catalogue ASCC-2.5, we obtain core and tidal radii, as well as tidal masses. The distributions of the core and tidal radii peak at about 1.5 pc and 7 - 10 pc, respectively. A typical relative error of the core radius lies between 15% and 50%, whereas, for the majority of clusters, the tidal radius was determined with a relative accuracy better than 20%. Most of the clusters have tidal masses between 50 and 1000 , and for about half of the clusters, the masses were obtained with a relative error better than 50%.

11 pages, 7 figures, accepted for publication in Astronomy & Astrophysics

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