Abstract:
We present deep Johnson UBV and Cousins RI CCD photometry of three
young open clusters, namely, NGC 2129, NGC 1502 and King 12 reaching down to
V ∼ 22 mag. For the first time, we have reported optical CCD data for King 12. Fun-
damental parameters for these clusters have been determined by comparing colour-
colour and colour-magnitude diagrams (CMDs) with the theoretical models. The clus-
ter radii have been estimated to be 3.3, 1.7 and 3.9 pc for NGC 2129, NGC 1502 and
King 12 respectively. The reddenings E(B-V) have been determined to be 0.77±0.05,
0.68±0.05 and 0.63±0.05 while the corresponding distances have been found to be
2.1±0.1, 1.0±0.1 and 2.5±0.1 kpc respectively. The ages of the clusters have been
obtained after fitting theoretical stellar evolutionary models for solar metallicity Z =
0.019 isochrones with the observed CMDs. This gives an age of 10.0±0.1 Myr for all
the three clusters. The analysis shows that there is differential interstellar reddening in
the direction of all clusters.
