An investigation of open cluster Melotte 72 using Gaia DR2

Abstract

The estimation of the main parameters of star clusters is significant in astrophysical studies. The most important aspect of using the Gaia DR2 survey lies in the positions, parallax, and proper motions of cluster stars with homogeneous photometry that make the membership probability determine with high accuracy.In this respect, depending on Gaia DR2 database, an analysis of the open star cluster Melotte 72 is taking place here. It is located at a distance of 2,345 ± 108 pc with an age of 1.0 ± 0.5 Gyr. In studying the radial density profile, the radius is found to be 5.0 ± 0.15 arcmin. The reddening, the luminosity and mass functions, the total mass of the cluster, and the galactic geometrical distances (X ⊙ , Y ⊙ , Z ⊙ ), and the distance from the galactic center (R g ) have been estimated as well. Our study has shown a dynamical relaxation behavior of Melotte 72.

Astrophysical Studies of 9 Unstudied Open Star Clusters Using Gaia Dr3

“…malized unit weight error, RUWE, which indicates that the single-star model provides a good fit to the astrometric observations, when it is ≤ 1.4 (Tadross and Elhosseiny 2022). As a result, these member stars form the usual shape for the color-magnitude diagram, CMD of the cluster, (Hendy and Tadross 2021). When the radius of the cluster is calculated (see § 3), all the stars that fall within this radius are regarded as member stars, and the stars outside this radius are regarded as background field stars.…”