The Principal Astrophysical Parameters of the Open Clusters Gulliver 18 and Gulliver 58 Determined Using Gaia Edr3 Data

Abstract

A photometric and astrometric study of the two open star clusters Gulliver18 and Gulliver58 was carried out for the first time using the early third data release of the Gaia space observatory (Gaia-EDR3). By studying the proper motions, parallaxes, and color-magnitude diagrams of the two clusters, we determined their actual cluster membership. Therefore, ages, color excesses, and heliocentric distances of the clusters could be determined. The luminosity function, mass function, total mass, mass segregation, and relaxation time of Gulliver18 and Gulliver58 were estimated as well.

The astrophysical parameters of Majaess‐95 and Majaess‐225

“…By counting the stars in each concentric ring (sector) surrounding the cluster's center, we can determine the radial density profile (RDP). By dividing the sector's total number of stars by its surface area, the density of each sector is determined (Tadross 2018; Tadross & Elhosseiny 2022; Tadross & Hendy 2021). The cluster's surface density profile often describes a roughly exponential decrease from its center outward.…”