NAOC Open IR
Discovery of ubiquitous lithium production in low-mass stars
Kumar, Yerra Bharat1; Reddy, Bacham E.1,2; Campbell, Simon W.3; Maben, Sunayana1,4; Zhao, Gang1,4; Ting, Yuan-Sen5,6,7,8
2020-07-06
Source PublicationNATURE ASTRONOMY
ISSN2397-3366
Pages9
AbstractThe vast majority of stars with mass similar to that of the Sun are expected to destroy lithium (Li) gradually over the course of their lives, via low-temperature nuclear burning. This has now been supported by observations of hundreds of thousands of red giant stars(1-5). Here we perform a large-scale systematic investigation into the Li content of stars in the red clump phase of evolution, which directly follows the red giant branch phase. Surprisingly, we find that all red clump stars have high levels of Li for their evolutionary stage, with an increase of a factor of 40 over the end of the red giant branch stage, on average. This suggests that all low-mass stars undergo an Li production phase between the tip of the red giant branch and the red clump. We demonstrate that our finding is not predicted by stellar theory, revealing a stark tension between observations and models. We also show that the well-studied(1,2,4-6)very Li-rich giants, withA(Li) > +1.5 dex, represent only the extreme tail of the Li enhancement distribution, comprising 3% of red clump stars. Our findings suggest a new definition limit for Li-richness in red clump stars,A(Li) > -0.9 dex, which is much lower than the limit ofA(Li) > +1.5 dex used over many decades(1,5-9). Low-mass stars are expected to destroy their lithium content as they evolve, but this study of stars in the red clump evolutionary stage shows that their lithium abundance is on average forty times greater than at the end of the previous stage, something not predicted by theory.
Funding OrganizationNational Science Foundation of China ; National Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; NAOC, Beijing through the CAS PIFI grant ; NAOC, Beijing through the CAS PIFI grant ; Australian Research Council ; Australian Research Council ; NASA Hubble Fellowship grant - Space Telescope Science Institute ; NASA Hubble Fellowship grant - Space Telescope Science Institute ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; NAOC, Beijing through the CAS PIFI grant ; NAOC, Beijing through the CAS PIFI grant ; Australian Research Council ; Australian Research Council ; NASA Hubble Fellowship grant - Space Telescope Science Institute ; NASA Hubble Fellowship grant - Space Telescope Science Institute ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; NAOC, Beijing through the CAS PIFI grant ; NAOC, Beijing through the CAS PIFI grant ; Australian Research Council ; Australian Research Council ; NASA Hubble Fellowship grant - Space Telescope Science Institute ; NASA Hubble Fellowship grant - Space Telescope Science Institute ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; NAOC, Beijing through the CAS PIFI grant ; NAOC, Beijing through the CAS PIFI grant ; Australian Research Council ; Australian Research Council ; NASA Hubble Fellowship grant - Space Telescope Science Institute ; NASA Hubble Fellowship grant - Space Telescope Science Institute
DOI10.1038/s41550-020-1139-7
WOS KeywordGIANT ; ABUNDANCES
Language英语
Funding ProjectNational Science Foundation of China[11988101] ; National Science Foundation of China[11850410437] ; National Science Foundation of China[11890694] ; National Key R&D Program of China[2019YFA0405502] ; NAOC, Beijing through the CAS PIFI grant[2019VMA0009] ; Australian Research Council[FT160100046] ; Australian Research Council[DP190102431] ; NASA Hubble Fellowship grant - Space Telescope Science Institute[HST-HF2-51425.001]
Funding OrganizationNational Science Foundation of China ; National Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; NAOC, Beijing through the CAS PIFI grant ; NAOC, Beijing through the CAS PIFI grant ; Australian Research Council ; Australian Research Council ; NASA Hubble Fellowship grant - Space Telescope Science Institute ; NASA Hubble Fellowship grant - Space Telescope Science Institute ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; NAOC, Beijing through the CAS PIFI grant ; NAOC, Beijing through the CAS PIFI grant ; Australian Research Council ; Australian Research Council ; NASA Hubble Fellowship grant - Space Telescope Science Institute ; NASA Hubble Fellowship grant - Space Telescope Science Institute ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; NAOC, Beijing through the CAS PIFI grant ; NAOC, Beijing through the CAS PIFI grant ; Australian Research Council ; Australian Research Council ; NASA Hubble Fellowship grant - Space Telescope Science Institute ; NASA Hubble Fellowship grant - Space Telescope Science Institute ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; NAOC, Beijing through the CAS PIFI grant ; NAOC, Beijing through the CAS PIFI grant ; Australian Research Council ; Australian Research Council ; NASA Hubble Fellowship grant - Space Telescope Science Institute ; NASA Hubble Fellowship grant - Space Telescope Science Institute
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000546383100002
PublisherNATURE PUBLISHING GROUP
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82806
Collection中国科学院国家天文台
Corresponding AuthorKumar, Yerra Bharat; Zhao, Gang
Affiliation1.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab Opt Astron, Beijing, Peoples R China
2.Indian Inst Astrophys, Dept Sci & Technol, Bangalore, Karnataka, India
3.Monash Univ, Sch Phys & Astron, Clayton, Vic, Australia
4.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing, Peoples R China
5.Inst Adv Study, Olden Lane, Princeton, NJ 08540 USA
6.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
7.Observ Carnegie Inst Washington, Pasadena, CA 91101 USA
8.Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT, Australia
Recommended Citation
GB/T 7714
Kumar, Yerra Bharat,Reddy, Bacham E.,Campbell, Simon W.,et al. Discovery of ubiquitous lithium production in low-mass stars[J]. NATURE ASTRONOMY,2020:9.
APA Kumar, Yerra Bharat,Reddy, Bacham E.,Campbell, Simon W.,Maben, Sunayana,Zhao, Gang,&Ting, Yuan-Sen.(2020).Discovery of ubiquitous lithium production in low-mass stars.NATURE ASTRONOMY,9.
MLA Kumar, Yerra Bharat,et al."Discovery of ubiquitous lithium production in low-mass stars".NATURE ASTRONOMY (2020):9.
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