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**Based on observations collected at the UCO/Lick Observatory, USA, and the Canada–France–Hawaii Telescope.

doi:10.3847/1538-4357/833/2/225

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	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**Based on observations collected at the UCO/Lick Observatory, USA, and the Canada–France–Hawaii Telescope.
	Zhao,G.2,3; Mashonkina,L.4; Yan,H. L.2; Alexeeva,S.4; Kobayashi,C.5; Pakhomov,Yu.4; Shi,J. R.2,3; Sitnova,T.4; Tan,K. F.2; Zhang,H. W.1,6
刊名	The Astrophysical Journal
	2016-12-19
卷号	833 期号:2
关键词	Galaxy: evolution line: formation stars: abundances stars: atmospheres stars: late-type
ISSN号	0004-637X
DOI	10.3847/1538-4357/833/2/225
英文摘要	ABSTRACT 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] ? ?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] ? ?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] ? ?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.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-833-2-225
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/36096]
专题	中国科学院国家天文台
作者单位	1.Department of Astronomy, School of Physics, Peking University, Beijing 100871, China 2.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China; gzhao@nao.cas.cn 3.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China 4.Institute of Astronomy, Russian Academy of Sciences, RU-119017 Moscow, Russia; lima@inasan.ru 5.School of Physics, Astronomy and Mathematics, Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK 6.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China 7.UCO/Lick Observatory, University of California, 1156 High Street, Santa Cruz, CA 95064, USA 8.Research School of Astronomy and Astrophysics, Australian National University, 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**Based on observations collected at the UCO/Lick Observatory, USA, and the Canada–France–Hawaii Telescope.[J]. The 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**Based on observations collected at the UCO/Lick Observatory, USA, and the Canada–France–Hawaii Telescope..The 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**Based on observations collected at the UCO/Lick Observatory, USA, and the Canada–France–Hawaii Telescope.".The Astrophysical Journal 833.2(2016).