http://arxiv.org/abs/2104.11778
We conducted a photometric and astrometric study of three open stellar clusters (Collinder 467, Dolidze 18, and Ruprecht 70), which have not been photometrically studied before. The most important thing for using Gaia (DR2) database lies in the positions, parallax, and proper motions, which make us split cluster members from the field ones and get precise astrophysical parameters. On studying the radial density profiles of the clusters under study, the actual sizes are estimated and found larger using Gaia. From the color-magnitude diagrams and theoretical isochrones, we simultaneously determined the ages, distance moduli, and reddening of the clusters. However, considering the parallaxes of Gaia DR2 for the cluster members, we calculated the cluster distance and confirmed what we obtained from the color-magnitude diagram. Then, the Cartesian galactocentric coordinates (Xsun, Ysun, Zsun), and the distances from the galactic center (Rg) were also estimated. According to luminosity and mass functions, the total luminosity and total mass of the clusters are estimated. Our study shows that Collinder 467 is dynamically relaxed, and Ruprecht 70 has recently relaxed, while Dolidze 18 is not relaxed yet.
A. Tadross and y. Hendy
Tue, 27 Apr 21
76/85
Comments: 15 pages, 8 figures, 1 table
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