Spatial structure of the old open cluster NGC 2420 |
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| Authors: | Z I Peikov R M Rusev T Ruseva |
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| Institution: | (1) St. Climent Okhridsky Sofia University, Sofia, Bulgaria;(2) Institute of Astronomy, Sofia, Bulgaria |
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| Abstract: | The spatial structure of the intermediate and outer regions of the old open cluster NGC 2420 is analyzed using data from the catalog of Paparó. The differential and integrated distributions of the projected ΔF(r) and F(r)] and spatial Δf(r) and f(r)] stellar densities are obtained for various subsystems of cluster stars using Kholopov’s star-count method. Analysis of these curves shows that: (1) the cluster has at least three distinct spatial zones with different stellar-density gradients, (2) the each cluster subsystem has a layered structure, and (3) the spatial structure of the cluster changes systematically in the transition to subsystems containing fainter main-sequence stars. Empirical relations describing the structure of the cluster are also derived. Similar structural features can also be found in other globular and open clusters. |
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