| Issue |
A&A
Volume 675, July 2023
|
|
|---|---|---|
| Article Number | A67 | |
| Number of page(s) | 10 | |
| Section | Galactic structure, stellar clusters and populations | |
| DOI | https://doi.org/10.1051/0004-6361/202244737 | |
| Published online | 03 July 2023 | |
Cluster aggregates surrounding Pismis 5 in the Vela molecular ridge⋆
1
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, No. 150, Science 1 Stree, Urumqi, Xinjiang, 830011
PR China
e-mail: zhy@xao.ac.cn
2
School of Astronomy and Space Science, University of Chinese Academy of Sciences, 19 Yuquan Road, Shijingshan District, Beijing, 100049
PR China
3
School of Physical Science and Technology, Xinjiang University, No. 777, Huarui Street, Urumqi, Xinjiang, 830017
PR China
Received:
11
August
2022
Accepted:
31
March
2023
Context. In the Gaia era, the precision of astrometric data is unprecedented. High-quality data make it easier to find more cluster aggregates and gather further confirmation of these open clusters.
Aims. We use Gaia Data Release 3 (DR3) to redetermine the open clusters surrounding Pismis 5 in the Vela molecular ridge (VMR). We also investigate the basic properties of these clusters.
Methods. We applied two clustering algorithms (STARGO and pyUPMASK) to identify the open-cluster members in five-dimensional space with α, δ, ϖ, μαcos δ, and μδ.
Results. We identify eight open clusters surrounding Pismis 5 in the VMR. The open cluster QZ 1 is newly discovered. As a result of our investigation of the comprehensive properties of the clusters, we present one open binary cluster candidate (Alessi 43 and Collinder 197) and one triple open-cluster candidate (Pismis 5, Pismis 5A, and Pismis 5B).
Conclusions. We identify binary and triple open-cluster candidates as potential primordial aggregates based on their similar age, position, and motion. According to kinematic speculations, the two aggregate candidates will gradually separate, and their interiors will slowly disintegrate.
Key words: open clusters and associations: general / Galaxy: stellar content
The table of member candidates for eight open clusters is only available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (130.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/675/A67.
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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