RED GIANT STARS FROM SLOAN DIGITAL SKY SURVEY. I. THE GENERAL FIELD
文献类型：期刊论文
| 作者 | Chen, Y. Q.1 ; Zhao, G.1; Carrell, K.1; Zhao, J. K.1; Tan, K. F.1; Nissen, P. E.1,2; Wei, P.1
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2014-11-01 |
| 卷号 | 795期号:1 |
| 关键词 | Galaxy: evolution Galaxy: halo Galaxy: structure stars: abundances stars: kinematics and dynamics surveys |
| 英文摘要 | We have obtained a sample of similar to 22,000 red giant branch (RGB) stars based on stellar parameters, provided by the ninth data release of the Sloan Digital Sky Survey, and the CH(G)/MgH indices, measured from the included spectra. The Galactic rest-frame velocity of Vgsr versus longitude for the sample shows the existence of several groups of stars from globular clusters and known streams. Excluding these substructures, a sample of similar to 16,000 RGB stars from the general field is used to investigate the properties of the thick disk, the inner halo, and the outer halo of our Galaxy. The metallicity and rotational velocity distributions are investigated for stars at 0 kpc < vertical bar Z vertical bar < 10 kpc. It is found that the canonical thick disk dominates at 0 kpc < vertical bar Z vertical bar < 2 kpc and its contribution becomes negligible at vertical bar Z vertical bar > 3 kpc. The MWTD is present and overlaps with the inner halo at 1 kpc < vertical bar Z vertical bar < 3 kpc. The inner halo starts at 2 kpc < vertical bar Z vertical bar < 3 kpc and becomes the dominated population for 4 kpc < vertical bar Z vertical bar < 10 kpc. For halo stars with vertical bar Z vertical bar > 5 kpc, bimodal metallicity distributions are found for 20 kpc < vertical bar Z vertical bar < 25 kpc and 35 kpc < RR < 45 kpc, which suggests a dual halo, the inner and the outer halo, as reported in Carollo et al. at low vertical bar Z vertical bar values. The peak of metallicity for the inner halo is at [Fe/H] similar to -1.6 and appears to be at [Fe/H] similar to -2.3 for the outer halo. The transition point from the inner to the outer halo is located at vertical bar Z vertical bar similar to 20 kpc and RR similar to 35 kpc. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000343857300052 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6578]  |
| 专题 | 国家天文台_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.Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, DK-8000 Aarhus C, Denmark |
| 推荐引用方式 GB/T 7714 | Chen, Y. Q.,Zhao, G.,Carrell, K.,et al. RED GIANT STARS FROM SLOAN DIGITAL SKY SURVEY. I. THE GENERAL FIELD[J]. ASTROPHYSICAL JOURNAL,2014,795(1). |
| APA | Chen, Y. Q..,Zhao, G..,Carrell, K..,Zhao, J. K..,Tan, K. F..,...&Wei, P..(2014).RED GIANT STARS FROM SLOAN DIGITAL SKY SURVEY. I. THE GENERAL FIELD.ASTROPHYSICAL JOURNAL,795(1). |
| MLA | Chen, Y. Q.,et al."RED GIANT STARS FROM SLOAN DIGITAL SKY SURVEY. I. THE GENERAL FIELD".ASTROPHYSICAL JOURNAL 795.1(2014). |
入库方式： OAI收割
来源：国家天文台
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