An In-depth Investigation of the Primordial Cluster Pair ASCC 19 and ASCC 21
Utilizing Gaia data from the literature, we report a new young (∼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 velociti...
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2025-01-01
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| Series: | The Astronomical Journal |
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| Online Access: | https://doi.org/10.3847/1538-3881/ada443 |
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| author | Qingshun Hu Yuting Li Mingfeng Qin Chenglong Lv Yang Pan Yangping Luo Shuo Ma |
| author_facet | Qingshun Hu Yuting Li Mingfeng Qin Chenglong Lv Yang Pan Yangping Luo Shuo Ma |
| author_sort | Qingshun Hu |
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| description | Utilizing Gaia data from the literature, we report a new young (∼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. |
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| institution | Kabale University |
| issn | 1538-3881 |
| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-cf9285cc4c0f4588af3cfe750a9562ef2025-01-28T06:02:04ZengIOP PublishingThe Astronomical Journal1538-38812025-01-0116929810.3847/1538-3881/ada443An In-depth Investigation of the Primordial Cluster Pair ASCC 19 and ASCC 21Qingshun Hu0https://orcid.org/0000-0002-5448-6267Yuting Li1https://orcid.org/0009-0000-6351-4250Mingfeng Qin2https://orcid.org/0000-0002-0040-8351Chenglong Lv3https://orcid.org/0000-0001-6354-1646Yang Pan4https://orcid.org/0000-0001-8637-5492Yangping Luo5https://orcid.org/0000-0003-3736-6076Shuo Ma6https://orcid.org/0000-0002-8324-0506School of Physics and Astronomy, China West Normal University , No. 1 Shida Road, Nanchong 637002, People’s Republic of China ; qingshun0801@163.comSchool of Physics and Astronomy, China West Normal University , No. 1 Shida Road, Nanchong 637002, People’s Republic of China ; qingshun0801@163.comInstitute for Frontiers in Astronomy and Astrophysics, Beijing Normal University , Beijing 102206, People’s Republic of China; School of Physics and Astronomy, Beijing Normal University , Beijing 100875, People’s Republic of ChinaXinjiang Astronomical Observatory, Chinese Academy of Sciences , No. 150, Science 1 Street, Urumqi, Xinjiang 830011, People’s Republic of ChinaSchool of Physics and Astronomy, China West Normal University , No. 1 Shida Road, Nanchong 637002, People’s Republic of China ; qingshun0801@163.comSchool of Physics and Astronomy, China West Normal University , No. 1 Shida Road, Nanchong 637002, People’s Republic of China ; qingshun0801@163.comDepartment of Astronomy, Xiamen University , Xiamen, Fujian 361005, People’s Republic of ChinaUtilizing Gaia data from the literature, we report a new young (∼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.https://doi.org/10.3847/1538-3881/ada443Open star clustersYoung star clusters |
| spellingShingle | Qingshun Hu Yuting Li Mingfeng Qin Chenglong Lv Yang Pan Yangping Luo Shuo Ma An In-depth Investigation of the Primordial Cluster Pair ASCC 19 and ASCC 21 The Astronomical Journal Open star clusters Young star clusters |
| title | An In-depth Investigation of the Primordial Cluster Pair ASCC 19 and ASCC 21 |
| title_full | An In-depth Investigation of the Primordial Cluster Pair ASCC 19 and ASCC 21 |
| title_fullStr | An In-depth Investigation of the Primordial Cluster Pair ASCC 19 and ASCC 21 |
| title_full_unstemmed | An In-depth Investigation of the Primordial Cluster Pair ASCC 19 and ASCC 21 |
| title_short | An In-depth Investigation of the Primordial Cluster Pair ASCC 19 and ASCC 21 |
| title_sort | in depth investigation of the primordial cluster pair ascc 19 and ascc 21 |
| topic | Open star clusters Young star clusters |
| url | https://doi.org/10.3847/1538-3881/ada443 |
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