Chemical and Kinematic Analysis of CN-strong Metal-poor Field Stars in LAMOST DR3

doi:10.3847/1538-4357/aaf6b1

CORC > 国家天文台 > 中国科学院国家天文台

	Chemical and Kinematic Analysis of CN-strong Metal-poor Field Stars in LAMOST DR3
	Tang,Baitian 7; Liu,Chao 8; Fernández-Trincado,J. G.5,9,10; Geisler,Doug 1,9,11; Shi,Jianrong 8; Zamora,Olga 2,3; Worthey,Guy 4; Moreno,Edmundo 6
刊名	The Astrophysical Journal
	2019-01-22
卷号	871 期号:1
关键词	stars: abundances stars: chemically peculiar stars: evolution stars: kinematics and dynamics
ISSN号	0004-637X
DOI	10.3847/1538-4357/aaf6b1
英文摘要	Abstract The large amount of chemical and kinematic information available in large spectroscopic surveys has inspired the search for chemically peculiar stars in the field. Though these metal-poor field stars ([Fe/H] < ?1) are commonly enriched in nitrogen, their detailed spatial, kinematic, and chemical distributions suggest that various groups may exist, and thus their origin is still a mystery. To study these stars statistically, we increase the sample size by identifying new CN-strong stars with LAMOST DR3 for the first time. We use CN–CH bands around 4000 ??to find CN-strong stars, and further separate them into CH-normal stars (44) and CH-strong (or CH) stars (35). The chemical abundances from our data-driven software and APOGEE DR14 suggest that most CH-normal stars are N-rich, and this cannot be explained by an internal mixing process alone. The kinematics of our CH-normal stars indicate that a substantial fraction of these stars are retrograding, pointing to an extragalactic origin. The chemistry and kinematics of CH-normal stars imply that they may be stars dissolved from globular clusters, or accreted halo stars, or both.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-871-1-AAF6B1
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/24700]
专题	中国科学院国家天文台
作者单位	1.Departamento de Física y Astronomía, Facultad de Ciencias, Universidad de La Serena, Av. Juan Cisternas 1200, La Serena, Chile 2.Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain 3.Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain 4.Department of Physics and Astronomy, Washington State University, Pullman, WA 99163-2814, USA 5.Instituto de Astronomía y Ciencias Planetarias, Universidad de Atacama, Copayapu 485, Copiapó, Chile 6.Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70264, México D.F., 04510, Mexico 7.School of Physics and Astronomy, Sun Yat-sen University, Zhuhai 519082, People's Republic of China; tangbt@mail.sysu.edu.cn 8.Key Lab of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China 9.Departamento de Astronomía, Casilla 160-C, Universidad de Concepción, Concepción, Chile 10.Institut Utinam, CNRS UMR 6213, Université Bourgogne-Franche-Comté, OSU THETA Franche-Comté, Observatoire de Besan?on, BP 1615, F-25010 Besan?on Cedex, France
推荐引用方式 GB/T 7714	Tang,Baitian,Liu,Chao,Fernández-Trincado,J. G.,et al. Chemical and Kinematic Analysis of CN-strong Metal-poor Field Stars in LAMOST DR3[J]. The Astrophysical Journal,2019,871(1).
APA	Tang,Baitian.,Liu,Chao.,Fernández-Trincado,J. G..,Geisler,Doug.,Shi,Jianrong.,...&Moreno,Edmundo.(2019).Chemical and Kinematic Analysis of CN-strong Metal-poor Field Stars in LAMOST DR3.The Astrophysical Journal,871(1).
MLA	Tang,Baitian,et al."Chemical and Kinematic Analysis of CN-strong Metal-poor Field Stars in LAMOST DR3".The Astrophysical Journal 871.1(2019).