Astrometric and Photometric Investigation of Three Old Age Open Clusters in the Gaia Era: Berkeley 32, Berkeley 98, and King 23

Abstract Using the photometric and kinematical data from Gaia Data Release 2, three old open clusters namely Berkeley 32 (Be 32), 98 98), King 23 are investigated. The latter two of these poorly studied in literature. numbers most probable cluster members 563, 260, 114 for Be 32, 98, 23, respectively, with membership probabilities higher than 80% lying within clusters’ limiting radii. Mean proper motions (PMs; ? ? ) determined as (?0.34 ± 0.008, ?1.60 0.006), (?1.34 0.007, ?3.22 0.008), (?0.46 0.009, ?0.87 0.012) mas yr ?1 . errors mentioned PMs Gaussian fitting errors. blue straggler stars (BSS) all were found to exhibit centralized radial distribution. radii 94, 1295, 66 using density profiles. Ages by isochrone 4.90 0.22, 3.23 0.15, 1.95 0.22 Gyr. given ages internal mass function slopes be flatter Salpeter’s value clusters. All dynamically relaxed. Galactic orbits derived clusters, which demonstrate that follow a circular path around center.