CCD photometry of the unstudied galactic star clusters Be 10, Be 67 and To 5

Abstract

We present the broad band Johnson UBV and Cousins RI CCD photometric observations for open clusters Be 10, Be 67 and To 5. So far no photometric study of these clusters in published. The colour-magnitude diagrams indicate that all the three clusters are of intermediate age. The reddening E(B-V), estimate from colour-colour diagrams/colour-magnitude diagrams, is 0.87±0.05 mag for Be 10, 0.79±0.05 mag for Be 67 and 0.80±0.05 mag for To 5. The comparison of colour magnitude diagrams with the stellar models with convective overshoot by Girardi et al. (2002) produces a good fit for a metallicity Z=0.008 for cluster Be 10 and Z=0.02 for clusters Be 67 and To 5. Ages for Be 10, Be 67 and To 5 are log (age) = 8.8±0.1, 9.0±0.1 and 8.3±0.2 respectively.