Binary open clusters in the Gaia data

Author:

Song FangfangORCID,Esamdin AliORCID,Hu QingshunORCID,Zhang MengfanORCID

Abstract

Context. Observations indicate that the fraction of potential binary star clusters in the Milky Way is either the same or lower than that of the Magellanic Clouds. The unprecedented precision in the parallax measurements by Gaia has allowed for the discovery of a growing number of new binary open clusters (OCs). Aims. We aim to survey the candidates of truly binary open clusters that are formed simultaneously, using information from the Gaia database. Methods. Based on the most recent catalog of open clusters, we investigated the interactions of adjacent binary open clusters in our Galaxy within separations of 50 pc. We compared their coordinates, proper motions, parallaxes, and color-magnitude diagrams (CMDs) via binary plots for all candidate pairs. The candidates of truly binary open clusters are selected on the basis of their common proper motions and consistent behaviors in the CMDs of different clusters that are limited to a separation of 50 pc. Results. About ten pairs of the selected binary open clusters appear to be the same clusters, based on evidence that almost half of the cluster members are shared. Fourteen pairs are possibly true binaries, implying that they may come from the same clouds, among which five pairs are newly discovered. In addition, two clusters, UBC 46 and UBC 192, were found to be part of the stellar complex LISCA I. Our results confirm that OCs born in groups are usually composed of young open clusters.

Publisher

EDP Sciences

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 8 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Exploring Galactic open clusters with Gaia;Astronomy & Astrophysics;2024-08-27

2. A Rare Cepheid-hosting Open Cluster Triad in Sagittarius;Research Notes of the AAS;2024-08-22

3. Structural properties of subgroups of stars associated with open clusters;Monthly Notices of the Royal Astronomical Society;2024-08-21

4. Open superclusters;Astronomy & Astrophysics;2024-06-26

5. Investigating 56 High Galactic Latitude Open Cluster Candidates in Gaia DR3;The Astrophysical Journal;2024-04-01

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