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Meridional Circulation. I. A Formation Channel for Lithium-rich and Super-lithium-rich Red Clump Stars

文献类型：期刊论文

作者Li XF(李雪峰)7; Shi, Jian-Rong5,6; Li Y(李焱)3,4,5,7; Yan, Hong-Liang2,5,6; Zhang, Jing-Hua1
刊名ASTROPHYSICAL JOURNAL LETTERS
出版日期2025-03-20
卷号982期号:1
ISSN号2041-8205
DOI10.3847/2041-8213/adb833
产权排序第1完成单位
文献子类Article
英文摘要Current observations indicate that stars with higher rotation rates appear to maintain more surface lithium, and the majority of lithium-rich giants are indeed red clump stars. Hence, we investigate the mechanisms behind lithium enrichment in rotating red clump stars and the pathways to forming lithium-rich red clump stars. Meridional circulation is prevalent in the radiative zone of rotating giants. We model its radial mixing as a diffusion process and derive the corresponding diffusion coefficient based on its material transfer effect. Due to uncertainties in numerical calculations, we consider an average diffusion effect. Additionally, certain limiting conditions for the radial velocity of meridional circulation are incorporated. With varying input rotation velocities, we simulate the lithium evolution for red clump stars with this model. Our results indicate that the material transfer effect due to meridional circulation can efficiently transport beryllium, produced by H burning, into the convective envelope. This meridional circulation can lead to lithium enrichment, with a maximum lithium abundance increment approaching 3.0 dex. Consequently, it is capable of forming both lithium-rich and super-lithium-rich red clump stars. The degree of lithium enrichment exhibits a strong positive correlation with the rotation velocity, i.e., faster red clump stars show more surface lithium. Furthermore, our models indicate that lithium-rich red clump stars are relatively young (similar to 106 yr), which aligns with observation evidence.
学科主题天文学 ; 恒星与银河系
URL标识查看原文
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
WOS关键词GIANT STARS ; PHYSICAL-MECHANISM ; ANGULAR-MOMENTUM ; CLUSTER GIANTS ; ROTATING STARS ; LI ENHANCEMENT ; MASS STARS ; K-GIANT ; EVOLUTION ; TRANSPORT
资助项目Strategic Priority Research Program of the Chinese Academy of Sciences[XDB 41000000]; National Natural Science Foundation of China[11973079]; National Natural Science Foundation of China[12433009]; National Natural Science Foundation of China[12133011]; National Natural Science Foundation of China[11973052]; National Natural Science Foundation of China[12022304]; National Natural Science Foundation of China[12090040]; National Natural Science Foundation of China[12090044]; National Natural Science Foundation of China[12173080]; National Natural Science Foundation of China[12273104]; National Natural Science Foundation of China[12373036]; National Key R&D Program of China[2021YFA1600400]; National Key R&D Program of China[2021YFA1600402]; Natural Science Foundation of Yunnan Province[202201AT070158]; Yunnan Fundamental Research Projects[202401AS070045]; Youth Innovation Promotion Association of the CAS; NAOC Nebula Talents Program; NSFC[12103063]; China Postdoctoral Science Foundation[2020M680672]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001443427200001
出版者IOP Publishing Ltd
资助机构Strategic Priority Research Program of the Chinese Academy of Sciences[XDB 41000000] ; National Natural Science Foundation of China[11973079, 12433009, 12133011, 11973052, 12022304, 12090040, 12090044, 12173080, 12273104, 12373036] ; National Key R&D Program of China[2021YFA1600400, 2021YFA1600402] ; Natural Science Foundation of Yunnan Province[202201AT070158] ; Yunnan Fundamental Research Projects[202401AS070045] ; Youth Innovation Promotion Association of the CAS ; NAOC Nebula Talents Program ; NSFC[12103063] ; China Postdoctoral Science Foundation[2020M680672]
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28214]  
专题云南天文台_恒星物理研究组
云南天文台_中国科学院天体结构与演化重点实验室
作者单位1.South-Western Institute for Astronomy Research, Yunnan University, Chenggong District, Kunming 650500, People's Republic of China
2.Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing 102206, People's Republic of China;
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, People's Republic of China;
4.Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, Kunming 650216, People's Republic of China;
5.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China;
6.CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Beijing 100101, People's Republic of China;
7.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650216, People's Republic of China; lixuefeng@ynao.ac.cn;
推荐引用方式
GB/T 7714		 Li XF,Shi, Jian-Rong,Li Y,et al. Meridional Circulation. I. A Formation Channel for Lithium-rich and Super-lithium-rich Red Clump Stars[J]. ASTROPHYSICAL JOURNAL LETTERS,2025,982(1).
APA 李雪峰,Shi, Jian-Rong,李焱,Yan, Hong-Liang,&Zhang, Jing-Hua.(2025).Meridional Circulation. I. A Formation Channel for Lithium-rich and Super-lithium-rich Red Clump Stars.ASTROPHYSICAL JOURNAL LETTERS,982(1).
MLA 李雪峰,et al."Meridional Circulation. I. A Formation Channel for Lithium-rich and Super-lithium-rich Red Clump Stars".ASTROPHYSICAL JOURNAL LETTERS 982.1(2025).

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来源：云南天文台

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