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

doi:10.3847/2041-8213/adb833

YNAO OpenIR > 恒星物理研究组

	Meridional Circulation. I. A Formation Channel for Lithium-rich and Super-lithium-rich Red Clump Stars
	Li XF(李雪峰)1 ; Shi, Jian-Rong 2,3; Li Y(李焱)1,3,4,5 ; Yan, Hong-Liang 2,3,6; Zhang, Jing-Hua 7
发表期刊	ASTROPHYSICAL JOURNAL LETTERS
	2025-03-20
卷号	982 期号:1
DOI	10.3847/2041-8213/adb833
产权排序	第1完成单位
收录类别	SCI
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.
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]
项目资助者	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]
语种	英语
学科领域	天文学 ; 恒星与银河系
文章类型	Article
出版者	IOP Publishing Ltd
出版地	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN	2041-8205
URL	查看原文
WOS记录号	WOS:001443427200001
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	GIANT STARS ; PHYSICAL-MECHANISM ; ANGULAR-MOMENTUM ; CLUSTER GIANTS ; ROTATING STARS ; LI ENHANCEMENT ; MASS STARS ; K-GIANT ; EVOLUTION ; TRANSPORT
引用统计
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.ynao.ac.cn/handle/114a53/28214
专题	恒星物理研究组中国科学院天体结构与演化重点实验室
作者单位	1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650216, People's Republic of China; [email protected]; 2.CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Beijing 100101, People's Republic of China; 3.University of Chinese Academy of Sciences, Beijing 100049, 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.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, People's Republic of China; 6.Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing 102206, People's Republic of China; 7.South-Western Institute for Astronomy Research, Yunnan University, Chenggong District, Kunming 650500, People's Republic of China
第一作者单位	中国科学院云南天文台
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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