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The List of Possible Double and Multiple Open Clusters between Galactic Longitudes 240° and 270°

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Abstract—This work studies the candidate double and multiple open clusters (OCs) in the galactic sector from l = 240° to l = 270°, which contains the Vela-Puppis star formation region. To do that, we have searched the most recent and complete catalogues of OCs by hand to get an extensive list of 22 groups of OCs involving 80 candidate members. Gaia EDR3 has been used to review some of the candidate OCs and look for new OCs near the candidate groups. Gaia data also permitted filtering out most of the field sources that are not member stars of the OCs. The plotting of combined color-magnitude diagrams of candidate pairs has allowed, in several cases, endorsing or discarding their link. The most likely systems are formed by OCs less than 0.1 Gyr old, with only one eccentric OC in this respect. No probable system of older OCs has been found. Preliminary estimations of the fraction of known OCs that form part of groups (9.4 to 15%) support the hypothesis that the Galaxy and the Large Magellanic Cloud are similar in this respect. The results indicate that OCs are born in groups like stars are born in OCs.

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ACKNOWLEDGMENTS

This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This research made extensive use of the SI-MBAD database, and the VizieR catalogue access tool, operated at the CDS, Strasbourg, France (doi: 10.26093/cds/vizier), and of NASA Astrophysics Data System Bibliographic Services.

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  1. Facultad de Ciencias, Universidad Autónoma de Barcelona, 08193, Bellaterra, Catalonia, Spain

    J. Casado

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Casado, J. The List of Possible Double and Multiple Open Clusters between Galactic Longitudes 240° and 270°. Astron. Rep. 65, 755–775 (2021). https://doi.org/10.1134/S1063772921350018

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