A Photometric and Astrometric Study of Open Star Clusters FSR-163 and Majaess 215 Using Gaia DR3  

作　　者：Ola Ali A.L.Tadross A.I.Osman Z.M.Hayman 

机构地区：[1]Astronomy Department,National Research Institute of Astronomy and Geophysics,11421,Helwan,Cairo,Egypt [2]Astronomy Department,Faculty of Science,Cairo University,12613,Giza,Egypt

出　　处：《Research in Astronomy and Astrophysics》2024年第12期69-78,共10页天文和天体物理学研究(英文版)

摘　　要：We have examined most of the astrophysical properties of the two star clusters, FSR-163 and Majaess 215, using the third data release of the Gaia space mission(Gaia DR3). We utilized the py UPMASK method to allocate the probabilities of stars' membership candidates. Using the clusters' trigonometric parallaxes of the members with probabilities P > 50%,we calculated the distance to the clusters of 3290(±140) and 2833(±140) pc, respectively, which match well with our isochrone fitting results on the color–magnitude diagrams. We determined the age of the clusters, and they are 1.00(±0.15) and 3.55(±0.15) Gyr for FSR-163 and Majaess 215, respectively. We evaluated the following photometric parameters: reddenings, distances, galactic geometrical distances, luminosity–mass functions, and total masses of the two clusters. On studying the dynamic state of the two clusters, we found that Majaess 215 is more relaxed than FSR-163.

关 键 词：(Galaxy) open clusters and associations individual(FSR-163 and Majaess 215)-proper motions-stars luminosity function-mass function-catalogs-Astronomical Databases 

分 类 号：P12[天文地球—天体测量]