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In this paper, using 2MASS photometry, we study the structural and dynamicalproperties of four young star clusters viz. King 16, NGC 1931, NGC 637 and NGC189. For the clusters King 16, NGC 1931, NGC 637 and NGC 189, we obtain thelimiting radii of 7', 12', 6' and 5' which correspond to linear radii of 3.6pc, 8.85 pc, 3.96 pc and 2.8 pc respectively. The reddening values $E(B-V)$obtained for the clusters are 0.85, 0.65--0.85, 0.6 and 0.53 and their truedistances are 1786 pc, 3062 pc, 2270 pc and 912 pc respectively. Ages of theclusters are 6 Myr, 4 Myr, 4 Myr and 10 Myr respectively. We compare theirstructures, luminosity functions and mass functions ($\phi(M) = dN/dM \proptoM^{-(1+\chi)}$) to the parameter $\tau = t_{age}/t_{relax}$ to study the starformation process and the dynamical evolution of these clusters. We find that,for our sample, mass seggregation is observed in clusters or their cores onlywhen the ages of the clusters are comparable to their relaxation times ($\tau\geq 1$). These results suggest mass seggregation due to dynamical effects. Thevalues of $\chi$, which characterise the overall mass functions for theclusters are 0.96 $\pm$ 0.11, 1.16 $\pm$ 0.18, 0.55 $\pm$ 0.14 and 0.66 $\pm$0.31 respectively. The change in $\chi$ as a function of radius is a goodindicator of the dynamical state of clusters.

The structure and dynamics of young star clusters: King 16, NGC 1931, NGC 637 and NGC 189