EDP Sciences
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Volume 404, Number 1, June II 2003
Page(s) 217 - 222
Section Stellar clusters and associations
DOI http://dx.doi.org/10.1051/0004-6361:20030485

A&A 404, 217-222 (2003)
DOI: 10.1051/0004-6361:20030485

The embedded star clusters in the nebulae vdB-RN 92 and Gy 3-7 in Canis Majoris R1

J. B. Soares and E. Bica

Universidade Federal do Rio Grande do Sul, IF, CP 15051, Porto Alegre 91501-970, RS, Brazil
(Received 23 December 2002 / Accepted 25 March 2003)

We employed J, H and $ K_{\rm s}$ photometry from the 2MASS Point Source Catalogue to study the embedded star clusters in the nebulae vdB-RN 92 and Gy 3-7, which are located in the molecular cloud Canis Majoris R1. We employed colour-colour and colour-magnitudes diagrams together with theoretical pre-main sequence isochrones to derive their fundamental parameters. Ages are based on the fraction of stars with anomalous colours, supposedly of types Herbig AeBe and T Tauri. The vdB-RN 92 cluster has an age of 5-7 Myr and the Gy 3-7 cluster $\approx$2 Myr. The average reddening values are AV=4.4 and AV=6.3, respectively for vdB-RN 92 and Gy 3-7. The distance found for vdB-RN 92 was 1.5 kpc which is, within uncertainties, compatible with previous estimates for the complex. Gy 3-7 also appears to be related to the CMaR1 complex. We conclude that CMaR1 is a very active star-forming site, now with four star clusters in early evolutionary stages.

Key words: Galaxy: open clusters and associations: individual: Gy 3-7, vdB-RN 92

Offprint request: J. B. Soares, jules@if.ufrgs.br

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