A deep investigation of two poorly studied open clusters Haffner 22 and
  Melotte 71 in Gaia era
  This paper presents a deep investigation of two open clusters, Haffner 22 and
Melotte 71, using astrometric and photometric data from Gaia EDR3. We
identified 382 and 597 most probable cluster members with membership
probability higher than 50 percent. Mean proper motion in RA and DEC are
estimated as -1.63 and 2.889 respectively for Haffner 22 and -2.398 and 4.210
for Melotte 71. A comparison of observed CMDs with theoretical isochrones leads
to an age of 2.25 and 1.27 Gyr for these clusters. The distances 2.88 and 2.28
kpc based on parallax are comparable with the values derived by isochrone
fitting method. Five and four blue straggler stars are identified as cluster
members in Haffner 22 and Melotte 71 respectively. Based on the relative number
of high velocity (binary) and single stars, we inferred binary fractions for
both clusters. We found binary content is larger in core region. Mass function
slope is in good agreement with the Salpeter's value while it is flat for
Haffner 22. Evidence for the existence of mass segregation effect is observed
in both clusters. Using the Galactic potential models, Galactic orbits are
derived, indicating that both clusters follow a circular path around the
Galactic center, evolving slowly.
