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Effect of Matter Accretion on Lithium Enhancement of Giants

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; Guo, Fei8
刊名ASTROPHYSICAL JOURNAL
出版日期2025-09-10
卷号990期号:2
ISSN号0004-637X
DOI10.3847/1538-4357/adf6b3
产权排序第1完成单位
文献子类Article
英文摘要A subset of low-mass giants (<2.2 M-circle dot) exhibit anomalous lithium enhancement behavior, which is still an open topic. Given that more massive giants retain more surface lithium, increasing mass by accreting circumstellar matter could be a channel to enriching lithium. We evaluate this process in the current work. Using the Modules for Experiments in Stellar Astrophysics, we construct a model of matter accretion, including mass loss, that evolves a star from the main-sequence turnoff to the red giant branch tip. The mean accretion rate is estimated from the upper limit of the accreted mass and the evolutionary time of the star during this period, and a grid of accretion rates is constructed. We separately consider their effects on the lithium enhancement of giants, both in terms of the mass and the composition of accretion. Accreting matter with higher lithium abundances has a promoting effect on the lithium enhancement of giants. The accreted matter with excess lithium alleviates the dilution of lithium in the convective envelope during the first dredge-up. The added mass results in lower temperatures at the bottom of the convective envelope, which likewise weaken the depletion of surface lithium. The weak accretion of circumstellar matter is a possible route to lithium enhancement for giants, and it predicts an upper limit on the lithium abundance of similar to 2.5 dex. However, the mass increment it requires poses a potential challenge to real astrophysical environments. Such accretion suppresses lithium dilution and depletion of the star during the first dredge-up, thus exhibiting lithium enhancement behavior.
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LI-RICH GIANTS ; IA SUPERNOVA EJECTA ; RED CLUMP STARS ; LOW-MASS STARS ; STELLAR EVOLUTION ; MAIN-SEQUENCE ; K-GIANTS ; CONVECTIVE BOUNDARIES ; STATISTICAL-ANALYSIS ; PHYSICAL-PROPERTIES
资助项目National Basic Science Center Project of China[12288102]; National Natural Science Foundation of China[11973079]; 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 CAS; NAOC Nebula Talents Program; NSFC[12103063]; China Postdoctoral Science Foundation[2020M680672]; Yunnan Province Foundation[202301AU070160]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001569425500001
出版者IOP Publishing Ltd
资助机构National Basic Science Center Project of China[12288102] ; National Natural Science Foundation of China[11973079, 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 CAS ; NAOC Nebula Talents Program ; NSFC[12103063] ; China Postdoctoral Science Foundation[2020M680672] ; Yunnan Province Foundation[202301AU070160]
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28575]  
专题云南天文台_恒星物理研究组
通讯作者Li XF(李雪峰)
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;
8.Yunnan Normal University, Kunming 650500, People’s Republic of China
推荐引用方式
GB/T 7714		 Li XF,Shi, Jian-Rong,Li Y,et al. Effect of Matter Accretion on Lithium Enhancement of Giants[J]. ASTROPHYSICAL JOURNAL,2025,990(2).
APA 李雪峰,Shi, Jian-Rong,李焱,Yan, Hong-Liang,Zhang, Jing-Hua,&Guo, Fei.(2025).Effect of Matter Accretion on Lithium Enhancement of Giants.ASTROPHYSICAL JOURNAL,990(2).
MLA 李雪峰,et al."Effect of Matter Accretion on Lithium Enhancement of Giants".ASTROPHYSICAL JOURNAL 990.2(2025).

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来源：云南天文台

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