Discovery and astrophysical properties of Galactic open clusters in
  dense stellar fields using Gaia DR2
  We report the discovery of 25 new open clusters resulting from a search in
dense low galactic latitude fields. We also provide, for the first time,
structural and astrophysical parameters for the new findings and 34 other
recently discovered open clusters using Gaia DR2 data. The candidates were
confirmed by jointly inspecting the vector point diagrams and spatial
distribution. The discoveries were validated by matching near known objects and
comparing their mean astrometric parameters with the available literature. A
decontamination algorithm was applied to the three-dimensional astrometric
space to derive membership likelihoods for clusters stars. By rejecting stars
with low membership likelihoods, we built decontaminated colour-magnitude
diagrams and derived the clusters astrophysical parameters by isochrone
fitting. The structural parameters were also derived by King-profile fittings
over the stellar distributions. The investigated clusters are mainly located
within 3 kpc from the Sun, with ages ranging from 30 Myr to 3.2 Gyr and
reddening limited to E(B-V)=2.5. On average, our cluster sample presents less
concentrated structures than Gaia DR2 confirmed clusters, since the derived
core radii are larger while the tidal radii are not significantly different.
Most of them are located in the IV quadrant of the Galactic disc at low
latitudes, therefore they are immersed in dense fields characteristic of the
inner Milky Way.
