PPMXL and Gaia Morphological Analysis of Melotte 22 (Pleaides) and 25
  (Hyades)
  In this article, we present a morphological study of the well-known extended
sized open clusters in the sky, Melotte 22 (Pleiades) and Melotte 25 (Hyades)
with J, H, and Ks regions due to Gaia DR2 and PPMXL catalogues. Based on proper
motions of these clusters, we extract our candidates and hence constructing
fitting isochrones with Solar metallicity Z = 0.019, log (age) = 8.2 +- 0.05
for Melotte 22, and metallicity Z = 0.024, log (age) = 8.9 +- 0.10 for Melotte
25. Some photometric parameters are estimated, e.g. cluster heliocentric
distances are 135 +- 3.6 and 47.51 +- 2.15 pc respectively, luminosity and mass
functions with mass-luminosity relation MLR of the second order polynomial, and
we have estimated the masses of Melotte 22 and Melotte 25 as 662.476 +- 25.73
Msun and 513.819 +- 22.65 Msun. The relaxation times of these clusters are
smaller than the estimated cluster ages, which indicate that these clusters are
dynamically relaxed. The second part is devoted to some kinematics of these
clusters due to internal and/or motion of members, the apex position is 95.60
+- 0.10, -48.21 +- 0.14 for Melotte 22, and 96.72 +- 1.15, 5.66 +- 0.12 for
Melotte 25. Also we have determined the components of space velocity and the
cluster centers in pc as well as elements of the Solar motion. The results are
in good agreement with those in the literature.
