A Gaia-based Photometric and Kinematic Analysis of the Old Open Cluster King 11

This paper presents an investigation of an old age open cluster King 11 using Gaia's Early Data Release 3 data. Considering the stars with membership probability (P ( mu )) > 90%, we identified 676 most probable cluster members within the cluster's limiting radius. The mean proper motion for King 11 is determined as: mu ( x ) = - 3.391 +/- 0.006 and mu ( y ) = - 0.660 +/- 0.004 mas yr(-1). The blue straggler stars of King 11 show a centrally concentrated radial distribution. The values of limiting radius, age, and distance are determined as 18.' 51, 3.63 +/- 0.42 Gyr, and 3.33 +/- 0.15 kpc, respectively. The cluster's apex coordinates (A = 267.degrees 84 +/- 1.degrees 01, D = - 27.degrees 48 +/- 1.degrees 03) are determined using the apex diagram method and verified using the (mu ( U ), mu ( T )) diagram. We also obtained the orbit that the cluster follows in the Galaxy and estimated its tentative birthplace in the disk. The resulting spatial velocity of King 11 is 60.2 +/- 2.16 km s(-1). A significant oscillation along the Z coordinate up to 0.556 +/- 0.022 kpc is determined.