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Metallicity and Kinematics of the Galactic Halo from the LAMOST Sample Stars

文献类型：期刊论文

作者Liu, Shuai2,3; Du, Cuihua2; Newberg, Heidi Jo1; Chen, Yuqin3; Wu, Zhenyu2,3; Ma, Jun2,3; Zhou, Xu3; Cao, Zihuang3; Hou, Yonghui4; Wang, Yuefei4
刊名ASTROPHYSICAL JOURNAL
出版日期2018-08-01
卷号862期号:2页码:8
ISSN号0004-637X
关键词Galaxy: abundances Galaxy: halo Galaxy: kinematics and dynamics
DOI10.3847/1538-4357/aacf91
英文摘要We study the metallicity distribution and kinematic properties of 4680 A/F/G/K-type giant stars with vertical bar z vertical bar> 5 kpc selected from the LAMOST spectroscopic survey. The metallicity distribution of giant stars with 5 < vertical bar z vertical bar <= 15 kpc can be described by a three-peak Gaussian model with peaks at [Fe/H] similar to -0.6 +/- 0.1, -1.2 +/- 0.3 and -2.0 +/- 0.2, corresponding to the ratio of 19%, 74%, and 7%, respectively. The [alpha/Fe] is used to associate the three peaks with the thick-disk, inner-halo and outer-halo components of the Galaxy. The metallicity distribution of these giant stars, which is fit with Gaussians corresponding to the three components, show a growing fraction of inner-halo components and declining fraction of the thick-disk components with increasing distance from the Galactic plane. Adopting a galaxy potential model, we also derive the orbital parameters of the sample stars, such as orbit eccentricity and rotation velocity. The peak values of derived orbital eccentricity for stars covering different metallicity regions maintain e similar to 0.75, independent of height above the plane, within the range 5 < vertical bar z vertical bar< 15 kpc. By comparing the MDFs of stars in different rotation velocity intervals, we find that the majority of the retrograde stars are more metal-poor than the prograde stars.
WOS关键词STELLAR ATMOSPHERIC PARAMETERS ; HORIZONTAL-BRANCH STARS ; DARK-MATTER HALOS ; MILKY-WAY ; FORMATION HISTORY ; ABUNDANCE RATIOS ; TELESCOPE LAMOST ; PROPER MOTIONS ; THICK DISK ; GALAXIES
资助项目National Natural Science Foundation of China ; Chinese Academy of Science[U1231113] ; Institute and the University of the Chinese Academy of Sciences ; China Scholarship Council (CSC) ; NSF[AST-1615688] ; Alfred P. Sloan Foundation ; National Science Foundation ; U.S. Department of Energy Office of Science ; National Natural Foundation of China (NSFC)[11373033] ; National Natural Foundation of China (NSFC)[11373035] ; National Natural Foundation of China (NSFC)[11625313] ; National Natural Foundation of China (NSFC)[11573035] ; National Basic Research Program of China (973 Program)[2014CB845702] ; National Basic Research Program of China (973 Program)[2014CB845704] ; National Basic Research Program of China (973 Program)[2013CB834902]
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000440726900001
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science ; Chinese Academy of Science ; Institute and the University of the Chinese Academy of Sciences ; Institute and the University of the Chinese Academy of Sciences ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; NSF ; NSF ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; National Science Foundation ; National Science Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; National Natural Foundation of China (NSFC) ; National Natural Foundation of China (NSFC) ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science ; Chinese Academy of Science ; Institute and the University of the Chinese Academy of Sciences ; Institute and the University of the Chinese Academy of Sciences ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; NSF ; NSF ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; National Science Foundation ; National Science Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; National Natural Foundation of China (NSFC) ; National Natural Foundation of China (NSFC) ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science ; Chinese Academy of Science ; Institute and the University of the Chinese Academy of Sciences ; Institute and the University of the Chinese Academy of Sciences ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; NSF ; NSF ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; National Science Foundation ; National Science Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; National Natural Foundation of China (NSFC) ; National Natural Foundation of China (NSFC) ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science ; Chinese Academy of Science ; Institute and the University of the Chinese Academy of Sciences ; Institute and the University of the Chinese Academy of Sciences ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; NSF ; NSF ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; National Science Foundation ; National Science Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; National Natural Foundation of China (NSFC) ; National Natural Foundation of China (NSFC) ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program)
源URL[http://ir.bao.ac.cn/handle/114a11/22298]  
专题中国科学院国家天文台
通讯作者Du, Cuihua
作者单位1.Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA
2.Univ Chinese Acad Sci, Coll Astron & Space Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
4.Chinese Acad Sci, Natl Astron Observ, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Jiangsu, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Shuai,Du, Cuihua,Newberg, Heidi Jo,et al. Metallicity and Kinematics of the Galactic Halo from the LAMOST Sample Stars[J]. ASTROPHYSICAL JOURNAL,2018,862(2):8.
APA Liu, Shuai.,Du, Cuihua.,Newberg, Heidi Jo.,Chen, Yuqin.,Wu, Zhenyu.,...&Zhang, Yong.(2018).Metallicity and Kinematics of the Galactic Halo from the LAMOST Sample Stars.ASTROPHYSICAL JOURNAL,862(2),8.
MLA Liu, Shuai,et al."Metallicity and Kinematics of the Galactic Halo from the LAMOST Sample Stars".ASTROPHYSICAL JOURNAL 862.2(2018):8.

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