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

The List of Possible Double and Multiple Open Clusters between Galactic Longitudes 240° and 270° —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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Astronomy Reports Springer Journals

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

Astronomy Reports , Volume 65 (9) – Sep 1, 2021

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Publisher
Springer Journals
Copyright
Copyright © Pleiades Publishing, Ltd. 2021. ISSN 1063-7729, Astronomy Reports, 2021, Vol. 65, No. 9, pp. 755–775. © Pleiades Publishing, Ltd., 2021.
ISSN
1063-7729
eISSN
1562-6881
DOI
10.1134/s1063772921350018
Publisher site
See Article on Publisher Site

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.

Journal

Astronomy ReportsSpringer Journals

Published: Sep 1, 2021

Keywords: binary open clusters; open cluster groups; open cluster formation; Gaia; manual search; Large Magellanic Cloud

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