Astrophysical and Structural Parameters of the Open Clusters NGC 6866, NGC 7062, and NGC 2360

TL;DR

This study derives astrophysical and structural parameters of three open clusters using 2MASS data, revealing insights into their mass functions, sizes, and potential black-hole presence, contributing to understanding cluster evolution.

Contribution

It provides new detailed parameters for NGC 6866, NGC 7062, and NGC 2360 using 2MASS data and field star decontamination, highlighting their structural properties and possible stellar remnants.

Findings

Core mass function slopes are flatter than halo slopes.

NGC 6866 and NGC 2360 have large core and cluster radii.

NGC 2360's longevity may be due to its location and mass.

Abstract

We derive astrophysical and structural parameters of the poorly studied open clusters NGC 6866, NGC 7062, and NGC 2360 based on filtered 2MASS (J, J -H) diagrams, and stellar radial density profiles. The field star decontamination technique is utilised for selecting high-probability cluster members. The E(B -V) reddening values of the three clusters derived from 2MASS JHKs agree with those inferred from UBV and uvby-{\beta} photometries. We find that the core mass function slopes are flatter than the halo's for the three clusters. The large core and cluster radii of NGC 6866 and NGC 2360 indicate an expanded core, which may suggest the presence of stellar mass black-holes. NGC 2360 is located in the third quadrant (l = 229.80), where Giant Molecular Clouds are scarce that, together with its relatively large mass (~ 1800 msun), might explain its longevity(~ 1.8Gyr) in the Galaxy.