Astrophysical and structural parameters of the open clusters NGC 6866, NGC 7062, and NGC 2360

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 − β 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 m⊙), might explain its longevity (∼1.8 Gyr) in the Galaxy.

► We derive astrophysical and structural parameters of NGC6866, NGC7062, and NGC2360. ► The field decontamination technique is utilized for determining cluster members. ► The large core of NGC6866 and NGC2360 may suggest the presence of black-holes. ► The relatively large mass of NGC2360 might explain its longevity in the Galaxy.