Moreover, the overall size of the clusters seems to increase slightly with age, but the fraction of stars in the halo seems to decrease. The size of the cores is smaller for old clusters than for young ones on average. This multiplies the number of these structures that are identified by more than four. We report the detection of vast coronae around almost all the clusters and report the detection of 71 OCs with tidal tails. Our method performs well on 389 clusters out of the 467 clusters we selected, including several recently discovered clusters that were poorly studied until now. We also evaluated the degree of mass segregation of the clusters and the correlations of these parameters with the age and Galactic position of the clusters. We fit a King’s function on the radial density profile of these clusters and a Gaussian mixture model (GMM) on their two-dimensional member distribution to study their shape.
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We used the clustering algorithm HDBSCAN on Gaia parallaxes and proper motions to systematically search for members up to 50 pc from the cluster centers. We then take advantage of these new member lists to study the morphological properties and the mass segregation levels of the clusters. We revisit the membership lists of OCs from the solar vicinity, in particular, by extending these membership lists to the peripheral areas through Gaia EDR3. The Gaia catalog is very appropriate for finding members of OCs at large distance from their centers.Īims. The analysis of structural parameters of OCs as a function of their age and position in the Galaxy constrains theoretical models of cluster evolution. The distribution of member stars in the surroundings of an open cluster (OC) can shed light on the process of its formation, evolution, and dissolution. University of Vienna, Department of Astrophysics, TürkenschanzstrWien, AustriaĬontext. Astrofísica, 38206 La Laguna, Tenerife, Spain Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain Leiden Observatory, Leiden University, Niels BohrCA Leiden, The Netherlands Bordeaux, CNRS, B18N, allée Geoffroy Saint-Hilaire, 33615 Pessac, FranceĮ-mail: de Ciències del Cosmos, Universitat de Barcelona (IEEC-UB), Martí i Franquès 1, 08028 Barcelona, Spain Laboratoire d’Astrophysique de Bordeaux, Univ. Astronomical objects: linking to databases.Including author names using non-Roman alphabets.
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