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| An In-depth Investigation of the Primordial Cluster Pair ASCC 19 and ASCC 21 | |
| Hu, Qingshun1; Li, Yuting1; Qin, Mingfeng2,3; Lv, Chenglong4; Pan, Yang1; Luo, Yangping1; Ma, Shuo5 | |
| 2025-02-03 | |
| Source Publication | ASTRONOMICAL JOURNAL
 |
| ISSN | 0004-6256 |
| Volume | 169Issue:2Pages:98 |
| Contribution Rank | 4 |
| Abstract | Utilizing Gaia data from the literature, we report a new young (similar to 8.9 Myr) cluster pair, ASCC 19 and ASCC 21, located near the Orion star-forming complex. The clusters are separated by a 3D distance of 27.00 +/- 7.51 pc. Both clusters share a common age (Log(age) = 6.95 +/- 0.05), similar radial velocities (RV = 21.34 +/- 4.47 km s-1 for ASCC 19 and RV = 20.05 +/- 3.86 km s-1 for ASCC 21), and comparable metallicities ([Fe/H] = -0.14 +/- 0.25 dex for ASCC 19 and [Fe/H] = -0.12 +/- 0.04 dex for ASCC 21, from LAMOST-DR11). These similarities suggest that the clusters likely originated from the fragmentation of the same molecular cloud, forming a primordial cluster pair. Furthermore, the formation of the two clusters is attributed to the coalescence of multiple subclusters, as inferred from the distribution analysis between metal abundances and distances to clusters' centers. Neither cluster shows significant mass segregation. Their members with RVs exceeding 100 km s-1 are young variables. Additionally, a tidal interaction between the clusters is observed. Comparisons of the Roche radius with tidal radii, as well as velocity difference with orbital velocity, suggest that the pair is an unbound system, that is, a double cluster. Finally, orbital motion simulations show that the clusters will not merge into a single system. |
| DOI | 10.3847/1538-3881/ada443 |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | OPEN STAR-CLUSTERS ; STELLAR VELOCITY DISTRIBUTION ; PARSEC EVOLUTIONARY TRACKS ; T TAURI STARS ; GLOBULAR-CLUSTERS ; MASS SEGREGATION ; DENSITY PROFILE ; GALACTIC DISC ; BINARY ; LAMOST |
| Funding Project | Natural Science Foundation for Young Scientists of Shanxi Province (Young Scientists Fund of the National Natural Science Foundation of China)https://doi.org/10.13039/501100020771[12173028] ; National Natural Science Foundation of China (NSFC)[493065] ; Fundamental Research Funds of China West Normal University (CWNU)[2021YFA1600401] ; Fundamental Research Funds of China West Normal University (CWNU)[2021YFA1600400] ; National Key R&D Program of China[CMS-CSST-2021-A10] ; Chinese Space Station Telescope project[21CXTD0038] ; Sichuan Youth Science and Technology Innovation Research Team[KCXTD2022-6] ; Innovation Team Funds of China West Normal[202308510136] ; China Scholarship Council program[NAS5-26555] ; Association of Universities for Research in Astronomy, Inc., under NASA ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope) ; Chinese Academy of Sciences |
| WOS Research Area | Astronomy & Astrophysics |
| WOS Subject | Astronomy & Astrophysics |
| WOS ID | WOS:001408292100001 |
| Publisher | IOP Publishing Ltd |
| Funding Organization | Natural Science Foundation for Young Scientists of Shanxi Province (Young Scientists Fund of the National Natural Science Foundation of China)https://doi.org/10.13039/501100020771 ; National Natural Science Foundation of China (NSFC) ; Fundamental Research Funds of China West Normal University (CWNU) ; National Key R&D Program of China ; Chinese Space Station Telescope project ; Sichuan Youth Science and Technology Innovation Research Team ; Innovation Team Funds of China West Normal ; China Scholarship Council program ; Association of Universities for Research in Astronomy, Inc., under NASA ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope) ; Chinese Academy of Sciences |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/7426 |
| Collection | 光学天文与技术应用研究室_变星研究团组 |
| Corresponding Author | Hu, Qingshun |
| Affiliation | 1.China West Normal Univ, Sch Phys & Astron, 1 Shida Rd, Nanchong 637002, Peoples R China 2.Beijing Normal Univ, Inst Frontiers Astron & Astrophys, Beijing 102206, Peoples R China 3.Beijing Normal Univ, Sch Phys & Astron, Beijing 100875, Peoples R China 4.Chinese Acad Sci, Xinjiang Astron Observ, 150,Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China 5.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China |
| Recommended Citation GB/T 7714 | Hu, Qingshun,Li, Yuting,Qin, Mingfeng,et al. An In-depth Investigation of the Primordial Cluster Pair ASCC 19 and ASCC 21[J]. ASTRONOMICAL JOURNAL,2025,169(2):98. |
| APA | Hu, Qingshun.,Li, Yuting.,Qin, Mingfeng.,Lv, Chenglong.,Pan, Yang.,...&Ma, Shuo.(2025).An In-depth Investigation of the Primordial Cluster Pair ASCC 19 and ASCC 21.ASTRONOMICAL JOURNAL,169(2),98. |
| MLA | Hu, Qingshun,et al."An In-depth Investigation of the Primordial Cluster Pair ASCC 19 and ASCC 21".ASTRONOMICAL JOURNAL 169.2(2025):98. |
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| Hu-2025-An In-depth （27587KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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