The Hyades Kinematical Structure with Gaia Era

Abstract

In this work, we have improved the Hyades members with crossmatch between Hipparcos and the recent Gaia EDR3 source, the obtained members with highly probable are about 186 candidates. Considering the classical convergent point and depending on proper motions and radial velocities, we have computed the apex position  which is in line with others. The internal structural parameters of the Hyades open cluster are demonstrated here with space spatial velocities; i.e., (-5.97±0.41, 45.54±6.75, 5.52±0.43) and  (-42.11±6.50, -19.09±4.37, -1.32±0.44) and on basis of matrix elements , the Velocity Ellipsoid Parameters were achieved, e.g.,  and . For the observational quantities, we have deduced a correlation coefficient of about  for the kinematical property of proper motions on both sides  and the physical property with the angular distances  from the vertex, and those prove that the attributes are completely related linearly.