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METALLICITY AND KINEMATIC DISTRIBUTIONS OF RED HORIZONTAL-BRANCH STARS FROM THE SDSS SURVEY
Chen, Y. Q.1; Zhao, G.1; Zhao, J. K.1; Xue, X. X.1; Schuster, W. J.2
2010-08-01
Source PublicationASTRONOMICAL JOURNAL
Volume140Issue:2Pages:500-509
AbstractOn the basis of a recently derived color-metallicity relation and stellar parameters from the Sloan Digital Sky Survey Data Release 7 spectroscopic survey, a large sample of red horizontal-branch (RHB) candidates have been selected to serve as standard candles. The metallicity and kinematic distributions of these stars indicate that they mainly originate from the thick-disk and the halo populations. The typical thick disk is characterized by the first group peaking at [Fe/H] similar to -0.6, V(rot) similar to 170 km s(-1) with a vertical scale height around vertical bar Z vertical bar similar to 1.2 kpc, while stars with [Fe/H] < -0.9 are dominated by the halo population. Two sub-populations of the halo are suggested by the RHB stars peaking at [Fe/H] similar to -1.3: one component with V(rot) > 0 km s(-1) (Halo I) shows a sign of metallicity gradient in the [Fe/H] versus vertical bar Z vertical bar diagram, while the other with V(rot) < 0 km s(-1) (Halo II) does not. The Halo I mainly clumps at the inner halo with R < 10 kpc and the Halo II comes both from the inner halo with R < 10 kpc and the outer halo with R > 10 kpc based on the star distribution in the R versus vertical bar Z vertical bar diagram.
KeywordGalaxy: Disk Galaxy: Halo Galaxy: Kinematics And Dynamics Stars: Horizontal-branch
DOI10.1088/0004-6256/140/2/500
Indexed BySCI
Language英语
WOS IDWOS:000279958000017
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7781
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Univ Nacl Autonoma Mexico, Observ Astron Nacl, Ensenada 22800, Baja California, Mexico
Recommended Citation
GB/T 7714
Chen, Y. Q.,Zhao, G.,Zhao, J. K.,et al. METALLICITY AND KINEMATIC DISTRIBUTIONS OF RED HORIZONTAL-BRANCH STARS FROM THE SDSS SURVEY[J]. ASTRONOMICAL JOURNAL,2010,140(2):500-509.
APA Chen, Y. Q.,Zhao, G.,Zhao, J. K.,Xue, X. X.,&Schuster, W. J..(2010).METALLICITY AND KINEMATIC DISTRIBUTIONS OF RED HORIZONTAL-BRANCH STARS FROM THE SDSS SURVEY.ASTRONOMICAL JOURNAL,140(2),500-509.
MLA Chen, Y. Q.,et al."METALLICITY AND KINEMATIC DISTRIBUTIONS OF RED HORIZONTAL-BRANCH STARS FROM THE SDSS SURVEY".ASTRONOMICAL JOURNAL 140.2(2010):500-509.
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