期刊
ASTROPHYSICS AND SPACE SCIENCE
卷 318, 期 1-2, 页码 25-33出版社
SPRINGER
DOI: 10.1007/s10509-008-9888-2
关键词
Star clusters: young; Near-infrared photometry; Color-magnitude diagrams; Pre-mainsequence stars; Initial mass function-relaxation time; 2MASS
资金
- National Aeronautics and Space Administration
- National Science Foundation
- Department of Science and Technology (DST), India
In this paper, using 2MASS photometry, we study the structural and dynamical properties of four young star clusters viz. King 16, NGC 1931, NGC 637 and NGC 189. For the clusters King 16, NGC 1931, NGC 637 and NGC 189, we obtain the limiting radii of 7', 12', 6' and 5' which correspond to linear radii of 3.6 pc, 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 true distances are 1786 pc, 3062 pc, 2270 pc and 912 pc respectively. Ages of the clusters are 6 Myr, 4 Myr, 4 Myr and 10 Myr respectively. We compare their structures, luminosity functions and mass functions (phi(M) = dN/dM proportional to M(-(1+chi))) to the parameter tau = t(age)/t(relax) to study the star formation process and the dynamical evolution of these clusters. We find that, for our sample, mass seggregation is observed in clusters or their cores only when the ages of the clusters are comparable to their relaxation times (t = 1). These results suggest mass seggregation due to dynamical effects. The values of., which characterize the overall mass functions for the clusters are 0.96 +/- 0.11, 1.16 +/- 0.18, 0.55 +/- 0.14 and 0.66 +/- 0.31 respectively. The change in chi as a function of radius is a good indicator of the dynamical state of clusters.
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