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A catalogue of 74 new open clusters found in Gaia Data-Release 2
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Based on astrometric data from Gaia DR2, we employ an unsupervised machine learning method to blindly search for open star clusters in the Milky Way within the Galactic latitude range of |b| < 20 degrees. In addition to 2,080 known clusters, 74 new open cluster candidates are found. In this work, we present the positions, apparent radii, parallaxes, proper motions and member stars of these candidates (https://cdsarc.u-strasbg.fr/ftp/vizier.submit//new_OC/). Meanwhile, to obtain the physical parameters of each candidate cluster, stellar isochrones are fit to the photometric data. The results show that the apparent radii and the observed proper motion dispersions of these new candidates are consistent with those of open clusters previously identified in Gaia DR2.
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Mapping the reddening plane in the Galactic disk through interstellar extinction of open clusters
Open clusters trace a wavy reddening plane offset 15.7 pc below the Sun, whose absorbing layer has a mean thickness of about 201 pc and a cluster scale height of 87 pc.
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