Hyades Kinematics and the Relationship Between Galactic Coordinates and its Angular Distance from the Apex with Gaia EDR3

Abstract

In this paper, we have improved the Hyades members with aid of the Gaia EDR3 source. We have studied their kinematics, including computations of the convergent point with AD-diagram method such as \(\left( {{{A}_{0}},~{{D}_{0}}} \right) = \left( {79^\circ .48 \pm 0^\circ .11,~\,\,6^\circ .85 \pm 0^\circ .38} \right)\), their spatial velocities \(U,~V,~W\,{\text{(km}}\;{{{\text{s}}}^{{ - 1}}}{\text{)}}\), their morphology with 3D. A relation was established for Hyades stars between their Galactic coordinates \(\left( {l,~b} \right)\) and the angular distances \(\left( {{\lambda }} \right)\) from the vertex. The precision criteria of this relation are very satisfactory and a correlation coefficient of value \( \approx 0.90\) was found which proves that the attributes are completely related linearly.