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Spectroscopic study of two new super Li-rich red clump K giants

文献类型：期刊论文

作者Singh, Raghubar2,3; Reddy, Bacham E.3; Kumar, Yerra Bharat1
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2019
卷号482期号:3页码:3822-3830
关键词stars: abundances stars: atmospheres stars: fundamental parameters stars: interiors stars: low-mass
ISSN号0035-8711
DOI10.1093/mnras/sty2939
英文摘要In this paper, we report the discovery of two new super Li-rich K giants: HD 24960 and TYC 1751-1713-1. Based on high-resolution (R approximate to 60000) spectroscopy, we have derived Li abundance of A(Li) approximate to 4.0 dex for both stars. Other elemental abundances are normal of typical K giants. Low ratios of [C/N] <= -0.25 and C-12/C-13 <= 10 suggest that the stars are in the upper red giant branch (RGB) phase. Further, based on Gala astrometry and secondary calibrations using Kepler asteroseismic and LAMOST spectroscopic data, we argue that both stars belong to the red clump (RC) phase with core He burning. Results add to a half-dozen already known RC Li-rich K giants and support the growing evidence that the origin of Li excess in RC giants seems to be associated with either He flash at the tip of the RGB or recent planet/ brown dwarf merger events closer to the RGB tip.
WOS关键词STELLAR EVOLUTION ; ISOTOPE RATIOS ; MAIN-SEQUENCE ; LITHIUM ; STARS ; BRANCH ; DEPLETION ; ABUNDANCE ; SEARCH ; HE-3
资助项目Chinese NDRC
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000462312600067
出版者OXFORD UNIV PRESS
资助机构Chinese NDRC ; Chinese NDRC ; Chinese NDRC ; Chinese NDRC ; Chinese NDRC ; Chinese NDRC ; Chinese NDRC ; Chinese NDRC
源URL[http://ir.bao.ac.cn/handle/114a11/25341]  
专题中国科学院国家天文台
通讯作者Singh, Raghubar; Reddy, Bacham E.; Kumar, Yerra Bharat
作者单位1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Pondicherry Univ RV Nagara, Kala Pet 605014, Puducherry, India
3.Indian Inst Astrophys, Bangalore 563004, Karnataka, India
推荐引用方式
GB/T 7714		 Singh, Raghubar,Reddy, Bacham E.,Kumar, Yerra Bharat. Spectroscopic study of two new super Li-rich red clump K giants[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,482(3):3822-3830.
APA Singh, Raghubar,Reddy, Bacham E.,&Kumar, Yerra Bharat.(2019).Spectroscopic study of two new super Li-rich red clump K giants.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,482(3),3822-3830.
MLA Singh, Raghubar,et al."Spectroscopic study of two new super Li-rich red clump K giants".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 482.3(2019):3822-3830.

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