SYSTEMATIC NON-LTE STUDY OF THE-2.6 <= [Fe/H] <= 0.2 F AND G DWARFS IN THE SOLAR NEIGHBORHOOD. II. ABUNDANCE PATTERNS FROM Li TO Eu

	SYSTEMATIC NON-LTE STUDY OF THE-2.6 <= [Fe/H] <= 0.2 F AND G DWARFS IN THE SOLAR NEIGHBORHOOD. II. ABUNDANCE PATTERNS FROM Li TO Eu
	Zhao, G.1,2 ; Mashonkina, L.3; Yan, H. L.1 ; Alexeeva, S.3; Kobayashi, C.4; Pakhomov, Yu.3; Shi, J. R.1,2 ; Sitnova, T.3; Tan, K. F.1 ; Zhang, H. W.5,6
刊名	ASTROPHYSICAL JOURNAL
	2016-12-20
卷号	833 期号:2
关键词	Galaxy: evolution line: formation stars: abundances stars: atmospheres stars: late-type Supporting material: machine-readable table
英文摘要	For the first time, we present an extensive study of stars with individual non-LTE (NLTE) abundances for 17 chemical elements from Li to Eu in a sample of stars uniformly distributed over the -2.62 <= [Fe/H] <= +0.24 metallicity range that is suitable for the Galactic chemical evolution research. The star sample has been kinematically selected to trace the Galactic thin and thick disks and halo. We find new results and improve earlier ones as follows: (i) the element-to-iron ratios for Mg, Si, Ca, and Ti form a metal-poor (MP) plateau at a similar height of 0.3 dex, and the knee occurs at common [Fe/H]; similar or equal to 0.8. The knee at the same metallicity is observed for [O/Fe], and the MP plateau is formed at [O/Fe] = 0.61. (ii) The upward trend of [C/O] with decreasing metallicity exists at [Fe/H] < -1.2, supporting the earlier finding of Akerman et al. (iii) An underabundance of Na relative to Mg in the [Fe/H] < -1 stars is nearly constant, with the mean [Na/Mg]; similar or equal to -0.5. (iv) The K/Sc, Ca/Sc, and Ti/Sc ratios form well-defined trends, suggesting a common site of the K-Ti production. (v) Sr follows the Fe abundance down to [Fe/H]; similar or equal to -2.5, while Zr is enhanced in MP stars. (vi) The comparisons of our results with some widely used Galactic evolution models are given. The use of the NLTE element abundances gives increased credit to the interpretation of the data in the context of the chemical evolution of the Galaxy.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	METAL-POOR STARS ; GALACTIC CHEMICAL EVOLUTION ; NEUTRON-CAPTURE ELEMENTS ; CORE-COLLAPSE SUPERNOVAE ; ABSOLUTE TRANSITION-PROBABILITIES ; HAMILTON ECHELLE SPECTROGRAPH ; MULTILEVEL RADIATIVE-TRANSFER ; HYDROGEN COLLISION DATA ; LAMBDA ITERATION METHOD ; EXTREME HALO STARS
收录类别	SCI
语种	英语
WOS记录号	WOS:000391169600100
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6809]
专题	国家天文台_光学天文研究部
作者单位	1.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 3.Russian Acad Sci, Inst Astron, RU-119017 Moscow, Russia 4.Univ Hertfordshire, Ctr Astrophys Res, Sch Phys Astron & Math, Coll Lane, Hatfield AL10 9AB, Herts, England 5.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China 6.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 7.Univ Calif Santa Cruz, UCO, Lick Observ, 1156 High St, Santa Cruz, CA 95064 USA 8.Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia
推荐引用方式 GB/T 7714	Zhao, G.,Mashonkina, L.,Yan, H. L.,et al. SYSTEMATIC NON-LTE STUDY OF THE-2.6 <= [Fe/H] <= 0.2 F AND G DWARFS IN THE SOLAR NEIGHBORHOOD. II. ABUNDANCE PATTERNS FROM Li TO Eu[J]. ASTROPHYSICAL JOURNAL,2016,833(2).
APA	Zhao, G..,Mashonkina, L..,Yan, H. L..,Alexeeva, S..,Kobayashi, C..,...&Zhai, M..(2016).SYSTEMATIC NON-LTE STUDY OF THE-2.6 <= [Fe/H] <= 0.2 F AND G DWARFS IN THE SOLAR NEIGHBORHOOD. II. ABUNDANCE PATTERNS FROM Li TO Eu.ASTROPHYSICAL JOURNAL,833(2).
MLA	Zhao, G.,et al."SYSTEMATIC NON-LTE STUDY OF THE-2.6 <= [Fe/H] <= 0.2 F AND G DWARFS IN THE SOLAR NEIGHBORHOOD. II. ABUNDANCE PATTERNS FROM Li TO Eu".ASTROPHYSICAL JOURNAL 833.2(2016).