LAMOST/HRS spectroscopic analysis of two new Li-rich giants  

作　　者：Ze-Ming Zhou Jian-Rong Shi Hong-Liang Yan Yong-Hui Hou Kai Zhang Qi Gao Xiao-Dong Xu Hai-Long Yuan Yu-Tao Zhou Kaike Pan Zi-Ye Sang Yong-Heng Zhao 

机构地区：[1]CAS Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Science,Beijing 100101,China [2]School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China [3]Nanjing Institute of Astronomical Optics&Technology,National Astronomical Observatories,Chinese Academy of Sciences,Nanjing 210042,China [4]Department of Astronomy,Peking University,Beijing 100871,China [5]Kavli Institute for Astronomy and Astrophysics,Peking University,Beijing 100871,China [6]Apache Point Observatory,Sunspot,New Mexico 88349,USA [7]Astronomy Department,New Mexico State University,Las Cruces,New Mexico 88003,USA

出　　处：《Research in Astronomy and Astrophysics》2021年第1期198-206,共9页天文和天体物理学研究（英文版）

基　　金：the National Key R&D Program of China(No.2019YFA0405502);the Key Research Program of the Chinese Academy of Sciences under grant No.XDPB09-02;the National Natural Science Foundation of China(Grant Nos.11973052,11833006,11473033 and 11603037);the International partnership program’s Key foreign cooperation project,Bureau of International Cooperation,Chinese Academy of Sciences(No.114A32KYSB20160049);supported by the Astronomical Big Data Joint Research Center,co-founded by the National Astronomical Observatories,Chinese Academy of Sciences and Alibaba Cloud;partially supported by the Open Project Program of the Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences;the financial support from China Scholarship Council(CSC,No.201604910642)for his study at New Mexico State University in the United States of America;the supports from Youth Innovation Promotion Association,Chinese Academy of Sciences;Guo Shou Jing Telescope(the Large Sky Area Multi-Object Fiber Spectroscopic Telescope LAMOST)is a National Major Scientific Project built by the Chinese Academy of Sciences.Funding for the project has been provided by the National Development and Reform Commission;the NASA/IPAC Infrared Science Archive,which is funded by the National Aeronautics and Space Administration;the Wide-field Infrared Survey Explorer,which is a joint project of the University of California,Los Angeles,and the Jet Propulsion Laboratory/California Institute of Technology,funded by the National Aeronautics and Space Administration。

摘　　要：Two Li-rich candidates,TYC 1338-1410-1 and TYC 2825-596-1,were observed by the new high-resolution echelle spectrograph,LAMOST/HRS.Based on their high-resolution and high-signal-tonoise ratio(SNR)spectra,we derived stellar parameters and abundances of 14 important elements for the two candidates.The stellar parameters and lithium abundances indicate that they are Li-rich K-type giants,and having A(Li)NLTE and 2.91 dex,respectively.Our analysis suggests that TYC 1338-1410-1 is probably a red giant branch(RGB)star at the bump stage,while TYC 2825-596-1 is most likely to be a core helium-burning red clump(RC)star.The line profiles of both spectra indicate that the two Li-rich giants are slow rotators and do not show infrared(IR)excess.We conclude that engulfment is not the lithium enrichment mechanism for either star.The enriched lithium of TYC 1338-1410-1 could be created via the Cameron-Fowler mechanism,while the lithium excess in TYC 2825-596-1 could be associated with either non-canonical mixing processes or He-flash.

关 键 词：stars:fundamental parameters stars:late-type stars:low-mass stars:abundances stars:chemically peculiar 

分 类 号：P144[天文地球—天体物理]