Volume 422, Number 2, August I 2004
|Page(s)||555 - 562|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||09 July 2004|
Discovery of three optical open clusters in the Galaxy
Universidade Federal do Rio Grande do Sul, Instituto de Física, CP 15051, Porto Alegre 91501-970, RS, Brazil e-mail: email@example.com
2 Universidade Estadual do Rio Grande do Sul, Unidade São Borja, Rua Bompland 512, São Borja 97670-000, RS, Brazil
Accepted: 31 March 2004
We report the discovery of three optical open clusters in the Milky Way. Two clusters are in Scutum (Cluster 1 at and , and Cluster 2 at and ), thus projected not far from the Galactic center direction, and the other is in Canis Major (Cluster 3 at and ), near the anti-center direction. Cluster 3 is less populous than Clusters 1 and 2, but presents evidence of being a physical system. The objects were found optically by inspecting maps obtained from the Guide Star Catalogue and images from the Digitized Sky Survey. No previous identification of a cluster has been reported in any of these areas so far. The analysis was carried out with 2MASS photometry in J and H. For Cluster 1 we derive an age of ± 5 Myr, a reddening ± 0.03 and a distance from the Sun ± 0.19 kpc; for Cluster 2, ± 100 Myr, ± 0.03 and ± 0.21 kpc; finally for Cluster 3, Myr, ± 0.03 and ± 0.35 kpc. Luminosity and mass functions are derived for Clusters 1 and 2 which, in turn, allow us to estimate their observed masses as and , respectively. Estimated total masses, by extrapolating the mass functions to , amount to and for the two clusters. Cluster 3 has an observed mass of ~. The present results indicate that further searches in the optical might still reveal new open clusters, especially in the infrared bands.
Key words: Galaxy: open clusters and associations: general / Galaxy: structure
© ESO, 2004
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