Abstract

In this paper, using 2MASS photometry, we study the mass functions Φ(M) = dN/dM ∝ M ^-(1+Â) of a sample of nine clusters of ages varying from 6 Myr to 1.2 Gyr and galactocentric distances from 6 - 12 kpc. We look for evidence of mass segregation in these clusters and trace the variation in the value of X in different regions of the cluster as a function of the parameter Τ = t_age=t_relax, galactocentric distances, age and size of the cluster.