Metallicity distributions of mono-age stellar populations of the Galactic disc from the LAMOST Galactic spectroscopic surveys

doi:10.1093/mnras/sty2797

CORC > 国家天文台 > 中国科学院国家天文台

	Metallicity distributions of mono-age stellar populations of the Galactic disc from the LAMOST Galactic spectroscopic surveys
	Wang, C.1; Liu, X. -W.1,2,3; Xiang, M. -S.4,5; Huang, Y.1,3; Chen, B. -Q.3; Yuan, H. -B.6; Ren, J. -J.4; Zhang, H. -W.1,2; Tian, Z. -J.1
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2019
卷号	482 期号:2 页码:2189-2207
关键词	Galaxy: abundances Galaxy: disc Galaxy: evolution Galaxy: formation Galaxy: structure
ISSN号	0035-8711
DOI	10.1093/mnras/sty2797
英文摘要	We have investigated the metallicity distributions of mono-age stellar populations across the disc for 6 <= R <= 12 kpc and \|Z\| less than or similar to 2 kpc using samples selected from the main-sequence turnoff and subgiant (MSTO-SG) stars targeted by the LAMOST Galactic spectroscopic surveys. Both the mean values and the profiles of the distributions exhibit significant variations with age and position. We have found that the oldest (> 11 Gyr) stars have nearly flat radial [Fe/H] gradients at all heights above the disc but show negative vertical [Fe/H] gradients. For stars younger than 11 Gyr, the radial [Fe/H] gradients flatten with \|Z\|, while the vertical [Fe/H] gradients flatten with R. Stars of 4-6 Gyr exhibit steeper negative radial I [Fe/H] gradients than those of either younger or older ages. The values of [alpha/Fe] of mono-age stellar populations also show significant radial and vertical gradients, with patterns varying with age. The [Fe/H] distribution profiles of old (>8 Gyr) stars vary little with R, while those of younger stars exhibit strong radial variations, probably as a consequence of significant radial migration. The radial distribution profiles of [alpha/Fe] show the opposite patterns of variations with age to those of [Fe/H]. We have also explored the impact of stellar mixing by epicycle motions (blurring) on the [Fe/H] and [alpha/Fe] distributions, and found that blurring changes mainly the widths of the distribution profiles. Our results suggest that the disc may have experienced a complex assemblage history, in which both the 'inside-out' and 'upside-down' formation processes may have played an important role.
资助项目	National Key Basic Research Program of China[2014CB845700] ; NSFC[11703035] ; National Natural Science Foundation of China[U1531244] ; National Natural Science Foundation of China[U1331120] ; National Natural Science Foundation of China[11473001] ; National Development and Reform Commission
WOS关键词	CHEMICAL EVOLUTION ; MILKY-WAY ; ABUNDANCE GRADIENTS ; PLANETARY-NEBULAE ; THICK DISK ; GAC ; STARS ; PARAMETERS ; EMERGENCE ; MIGRATION
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000454578700053
资助机构	National Key Basic Research Program of China ; National Key Basic Research Program of China ; NSFC ; NSFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; NSFC ; NSFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; NSFC ; NSFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; NSFC ; NSFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Development and Reform Commission ; National Development and Reform Commission
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/24282]
专题	中国科学院国家天文台
通讯作者	Wang, C.; Liu, X. -W.
作者单位	1.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 3.Yunnan Univ, South Western Inst Astron Res, Kunming 650091, Yunnan, Peoples R China 4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 5.Max Planck Inst Astron, D-69117 Heidelberg, Germany 6.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Wang, C.,Liu, X. -W.,Xiang, M. -S.,et al. Metallicity distributions of mono-age stellar populations of the Galactic disc from the LAMOST Galactic spectroscopic surveys[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,482(2):2189-2207.
APA	Wang, C..,Liu, X. -W..,Xiang, M. -S..,Huang, Y..,Chen, B. -Q..,...&Tian, Z. -J..(2019).Metallicity distributions of mono-age stellar populations of the Galactic disc from the LAMOST Galactic spectroscopic surveys.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,482(2),2189-2207.
MLA	Wang, C.,et al."Metallicity distributions of mono-age stellar populations of the Galactic disc from the LAMOST Galactic spectroscopic surveys".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 482.2(2019):2189-2207.