Abstract.
Young Open Clusters have always been a platform for the star
formation studies. It was assumed that all members in the cluster
are coeval, on the other hand, recent studies show the presence of
an age range among the members of young open clusters. Presence of
pre-main sequence (PMS) stars are identified by combining optical
and near-IR data for 13 young clusters. Age-wise and mass-wise
distribution of PMS stars are analysed to study how star formation
proceeded in the clusters. In all the clusters we studied, we find
an age range among the PMS stars and the duration of star formation
is found to be similar to the cluster age.
Key words: stars: formation -- stars: pre-main sequence --
(Galaxy:) open clusters and associations: general