New Open Cluster candidates Found in Galactic Disk Using Gaia DR2/EDR3
  Data
  We report 541 new open cluster candidates in Gaia EDR3 through revisiting the
cluster results from an earlier analysis of the Gaia DR2, which revealed nearly
a thousand open cluster candidates in the solar neighborhood (mostly d < 3 kpc)
resideing at Galactic latitudes |b| < 20 degrees. A subsequent comparison with
lists of known clusters shows a large increases of the cluster samples within 2
kpc from the Sun. We assign membership probabilities to the stars through the
open source pyUPMASK algorithm, and also estimate the physical parameters
through isochrone fitting for each candidate. Most of the new candidates show
small total proper motion dispersions and clear features in the color-magnitude
diagrams. Besides, the metallicity gradient of the new candidates is consistent
with those found in the literature. The cluster parameters and member stars are
available at CDS via anonymous ftp to cdsarc.u-strasbg.fr(130.79.128.5) or via
https://cdsarc.unistra.fr/viz-bin/cat/J/ApJS. The discovery of these new
objects shows that the open cluster samples in Gaia data is still not complete,
and more discoveries are expected in the future researches.
