NAOC Open IR
Keck/HIRES Spectroscopic Analysis of Barium Abundances
Liu, Shuai1,2; Shi, Jianrong1,2; Wu, Zhenyu1,2
2020-06-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume896Issue:1Pages:7
AbstractBased on the high-resolution, high signal-to-noise-ratio spectra from the Keck/HIRES, we have analyzed the barium abundances of 602 stars. The parameter space of our sample are in the range of 4700 < T-eff < 6100 K, -0.1 < [Fe/H] < 0.6 dex, and 2 < log g < 5 dex. It is found that the nonlocal thermodynamic equilibrium (NLTE) effects are large for barium, and the barium abundances can be underestimated by up to 0.2 dex compared to the the local thermodynamic equilibrium analysis for lines at 5853 and 6141 angstrom. In addition, the average barium abundances of the high- and low-alpha stars are -0.10 and 0.00 dex, respectively, and higher [Ba/Fe] corresponds to a lower [Mg/Fe] ratio. We note that there are 18 Ba-rich stars (with [Ba/Fe] > 0.3 in NLTE), which contains six dwarfs and 12 giants. The Ba-rich objects make up around 3% in our sample.
KeywordStellar abundances Galaxy structure
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; international partnership programs Key Foreign Cooperation Project ; international partnership programs Key Foreign Cooperation Project ; Bureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; W. M. Keck Foundation ; W. M. Keck Foundation ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; international partnership programs Key Foreign Cooperation Project ; international partnership programs Key Foreign Cooperation Project ; Bureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; W. M. Keck Foundation ; W. M. Keck Foundation ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; international partnership programs Key Foreign Cooperation Project ; international partnership programs Key Foreign Cooperation Project ; Bureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; W. M. Keck Foundation ; W. M. Keck Foundation ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; international partnership programs Key Foreign Cooperation Project ; international partnership programs Key Foreign Cooperation Project ; Bureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; W. M. Keck Foundation ; W. M. Keck Foundation
DOI10.3847/1538-4357/ab8f33
WOS KeywordCOOL DWARF STARS ; LTE LINE FORMATION ; BINARY NATURE ; MODEL ATMOSPHERES ; HEAVY-ELEMENTS ; MAFAGS-OS ; NUCLEOSYNTHESIS ; EVOLUTION ; MG ; BA
Language英语
Funding ProjectNational Key R&D Program of China[2019YFA0405502] ; National Natural Science Foundation of China[11833006] ; National Natural Science Foundation of China[11473033] ; National Natural Science Foundation of China[11603037] ; National Natural Science Foundation of China[11803049] ; international partnership programs Key Foreign Cooperation Project[114A32KYSB20160049] ; Bureau of International Cooperation, Chinese Academy of Sciences ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; W. M. Keck Foundation
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; international partnership programs Key Foreign Cooperation Project ; international partnership programs Key Foreign Cooperation Project ; Bureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; W. M. Keck Foundation ; W. M. Keck Foundation ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; international partnership programs Key Foreign Cooperation Project ; international partnership programs Key Foreign Cooperation Project ; Bureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; W. M. Keck Foundation ; W. M. Keck Foundation ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; international partnership programs Key Foreign Cooperation Project ; international partnership programs Key Foreign Cooperation Project ; Bureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; W. M. Keck Foundation ; W. M. Keck Foundation ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; international partnership programs Key Foreign Cooperation Project ; international partnership programs Key Foreign Cooperation Project ; Bureau of International Cooperation, Chinese Academy of Sciences ; Bureau of International Cooperation, Chinese Academy of Sciences ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; Alibaba Cloud ; Alibaba Cloud ; W. M. Keck Foundation ; W. M. Keck Foundation
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000542529900001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82984
Collection中国科学院国家天文台
Corresponding AuthorShi, Jianrong
Affiliation1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Liu, Shuai,Shi, Jianrong,Wu, Zhenyu. Keck/HIRES Spectroscopic Analysis of Barium Abundances[J]. ASTROPHYSICAL JOURNAL,2020,896(1):7.
APA Liu, Shuai,Shi, Jianrong,&Wu, Zhenyu.(2020).Keck/HIRES Spectroscopic Analysis of Barium Abundances.ASTROPHYSICAL JOURNAL,896(1),7.
MLA Liu, Shuai,et al."Keck/HIRES Spectroscopic Analysis of Barium Abundances".ASTROPHYSICAL JOURNAL 896.1(2020):7.
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