2003A&A...404..217S

We employed J, H and K_s photometry from the 2MASS Point Source Catalogue to study the embedded star clusters in the nebulae vdB-RN92 and Gy3-7, 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-RN92 cluster has an age of 5-7Myr and the Gy3-7 cluster ≃2Myr. The average reddening values are A_V=4.4 and A_V=6.3, respectively for vdB-RN92 and Gy3-7. The distance found for vdB-RN92 was 1.5 kpc which is, within uncertainties, compatible with previous estimates for the complex. Gy3-7 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.