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The Evolution of the Galactic Thick Disk with the LAMOST Survey
Li, Chengdong1,2; Zhao, Gang1,2
2017-11-20
发表期刊ASTROPHYSICAL JOURNAL
卷号850期号:1
摘要We select giant stars from LAMOST data release 3 (hereafter DR3) based on their spectral properties and atmospheric parameters in order to detect the structure and kinematic properties of the Galactic thick disk. The spatial motions of our sample stars are calculated. We obtain 2035 thick-disk giant stars by using a kinematic criterion. We confirm the existence of the metal-weak thick disk. The most metal-deficient star in our sample has [Fe H] = -2.34. We derive the radial and vertical metallicity gradients, which are + 0.035 +/- 0.010 and -0.164 +/- 0.010 dex kpc-1respectively. Then we estimate the scale length and scale height of the thick disk using the Jeans equation, and the results are h(R) = 3.0 +/- 0.1 kpc and h(Z) = 0.9 +/- 0.1 kpc. The scale length of the thick disk is approximately equal to that of the thin disk from several previous works. Finally, we calculate the orbital parameters of our sample stars, and discuss the formation scenario of the thick disk. Our result for the distribution of stellar orbital eccentricity excludes the accretion scenario. We conclude that the thick disk stars are mainly born inside the Milky Way.
文章类型Article
关键词Galaxy: Disk Galaxy: Evolution Galaxy: Kinematics And Dynamics Galaxy: Structure Methods: Data Analysis Stars: Abundances
WOS标题词Science & Technology ; Physical Sciences
资助者National Natural Science Foundation of China(11390371 ; National Natural Science Foundation of China(11390371 ; National Development and Reform Commission ; National Development and Reform Commission ; 11233004) ; 11233004) ; National Natural Science Foundation of China(11390371 ; National Natural Science Foundation of China(11390371 ; National Development and Reform Commission ; National Development and Reform Commission ; 11233004) ; 11233004)
DOI10.3847/1538-4357/aa93f4
关键词[WOS]LOCAL STELLAR KINEMATICS ; DARK-MATTER UNIVERSE ; MILKY-WAY TOMOGRAPHY ; DIGITAL SKY SURVEY ; CHEMICAL EVOLUTION ; TELESCOPE LAMOST ; RAVE DATA ; F-DWARF ; STARS ; GALAXY
收录类别SCI
语种英语
资助者National Natural Science Foundation of China(11390371 ; National Natural Science Foundation of China(11390371 ; National Development and Reform Commission ; National Development and Reform Commission ; 11233004) ; 11233004) ; National Natural Science Foundation of China(11390371 ; National Natural Science Foundation of China(11390371 ; National Development and Reform Commission ; National Development and Reform Commission ; 11233004) ; 11233004)
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000415297500005
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/20189
专题光学天文研究部
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
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Li, Chengdong,Zhao, Gang. The Evolution of the Galactic Thick Disk with the LAMOST Survey[J]. ASTROPHYSICAL JOURNAL,2017,850(1).
APA Li, Chengdong,&Zhao, Gang.(2017).The Evolution of the Galactic Thick Disk with the LAMOST Survey.ASTROPHYSICAL JOURNAL,850(1).
MLA Li, Chengdong,et al."The Evolution of the Galactic Thick Disk with the LAMOST Survey".ASTROPHYSICAL JOURNAL 850.1(2017).
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