NLTE Analysis of Copper Abundances in the Galactic Bulge Stars

doi:10.3847/1538-4357/ab1077

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	NLTE Analysis of Copper Abundances in the Galactic Bulge Stars
	Xu, X. D.1,2; Shi, J. R.1,2; Yan, H. L.1,2
刊名	ASTROPHYSICAL JOURNAL
	2019-04-20
卷号	875 期号:2 页码:9
关键词	Galaxy: bulge Galaxy: evolution line: formation line: profiles stars: abundances
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab1077
英文摘要	Based on the medium-high resolution (R similar to 20,000), modest signal-to-noise ratio (S/N greater than or similar to 70) FLAMES-GIRAFFE spectra, we investigated the copper abundances of 129 red giant branch stars in the Galactic bulge with [Fe/H] from -1.14 to 0.46 dex. The copper abundances are derived from both local thermodynamic equilibrium (LTE) and nonlocal thermodynamic equilibrium (NLTE) with the spectral synthesis method. We find that the NLTE effects for Cu I lines show a clear dependence on metallicity, and they gradually increase with decreasing [Fe/H] for our sample stars. Our results indicate that the NLTE effects of copper are important not only for metal-poor stars but also for supersolar metal-rich ones and the LTE results underestimate the Cu abundances. We note that the [Cu/Fe] trend of the bulge stars is similar to that of the Galactic disk stars spanning the metallicity range of -1.14 < [Fe/H] < 0.0 dex, and the [Cu/Fe] ratios increase with increasing metallicity when [Fe/H] is from similar to-1.2 to similar to-0.5 dex, favoring a secondary (metallicity-dependent) production of Cu.
资助项目	Key Research Program of the Chinese Academy of Sciences[XDPB09-02] ; National Key Basic Research Program of China[2014CB845700] ; National Natural Science Foundation of China[11833006] ; National Natural Science Foundation of China[11473033] ; National Natural Science Foundation of China[11603037] ; Astronomical Big Data Joint Research Center ; Alibaba Cloud
WOS关键词	MULTILEVEL RADIATIVE-TRANSFER ; LAMBDA ITERATION METHOD ; ATOM-ATOM COLLISIONS ; EXTREMELY METAL-POOR ; CHEMICAL EVOLUTION ; NEUTRON-CAPTURE ; CROSS-SECTIONS ; MASSIVE STARS ; NUCLEOSYNTHESIS ; HALO
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000465974900011
资助机构	Key Research Program of the Chinese Academy of Sciences ; Key Research Program of the Chinese Academy of Sciences ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud ; Key Research Program of the Chinese Academy of Sciences ; Key Research Program of the Chinese Academy of Sciences ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud ; Key Research Program of the Chinese Academy of Sciences ; Key Research Program of the Chinese Academy of Sciences ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud ; Key Research Program of the Chinese Academy of Sciences ; Key Research Program of the Chinese Academy of Sciences ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/26331]
专题	中国科学院国家天文台
通讯作者	Shi, J. R.
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Xu, X. D.,Shi, J. R.,Yan, H. L.. NLTE Analysis of Copper Abundances in the Galactic Bulge Stars[J]. ASTROPHYSICAL JOURNAL,2019,875(2):9.
APA	Xu, X. D.,Shi, J. R.,&Yan, H. L..(2019).NLTE Analysis of Copper Abundances in the Galactic Bulge Stars.ASTROPHYSICAL JOURNAL,875(2),9.
MLA	Xu, X. D.,et al."NLTE Analysis of Copper Abundances in the Galactic Bulge Stars".ASTROPHYSICAL JOURNAL 875.2(2019):9.