Sulphur and zinc abundances in Galactic stars and damped Ly alpha systems
文献类型：期刊论文
| 作者 | Nissen, PE; Chen, YQ ; Asplund, M; Pettini, M
|
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2004-03-01 |
| 卷号 | 415期号:3页码:993-1007 |
| 关键词 | stars : abundances stars : atmospheres galaxy : evolution galaxies : high-redshift quasars : absorption lines |
| 英文摘要 | High resolution spectra of 34 halo population dwarf and subgiant stars have been obtained with VLT/UVES and used to derive sulphur abundances from the lambdalambda8694.0, 8694.6 and lambdalambda9212.9, 9237.5 S I lines. In addition, iron abundances have been determined from 19 Fell lines and zinc abundances from the lambdalambda4722.2,4810.5 lines. The abundances are based on a classical ID, LTE model atmosphere analysis, but effects of 3D hydrodynamical modelling on the [S/Fe], [Zn/Fe] and [S/Zn] ratios are shown to be small. We find that most halo stars with metallicities in the range -3.2 < [Fe/H] < -0.8 have a near-constant [S/Fe] similar or equal to +0.3; a least square fit to [S/Fe] vs. [Fe/H] shows a slope of only -0.04 +/- 0.01. Among halo stars with -1.2 < [Fe/H] < -0.8 the majority have [S/Fe] = +0.3, but two stars (previously shown to have low alpha/Fe ratios) have [S/Fe] similar or equal to 0.0. For disk stars with [Fe/H] > - 1, [S/Fe] decreases with increasing [Fe/H]. Hence, sulphur behaves like other typical a-capture elements, Mg, Si and Ca. Zinc, on the other hand, traces iron over three orders of magnitude in [Fe/H], although there is some evidence for a small systematic Zn overabundance ([Zn/Fe] similar or equal to +0.1) among metal-poor disk stars and for halo stars with [Fe/H] < -2.0. Recent measurements of S and Zn in ten damped Lyα systems (DLAs) with redshifts between 1.9 and 3.4 and zinc abundances in the range -2.1 < [Zn/H] < -0.15 show an offset relative to the [S/Zn] - [Zn/H] relation in Galactic stars. Possible reasons for this offset are discussed, including low and intermittent star formation rates in DLAs. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000188936200020 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6946]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Univ Aarhus, Dept Phys & Astron, DK-8000 Aarhus C, Denmark 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Australian Natl Univ, Mt Stromlo Observ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia 4.Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England |
| 推荐引用方式 GB/T 7714 | Nissen, PE,Chen, YQ,Asplund, M,et al. Sulphur and zinc abundances in Galactic stars and damped Ly alpha systems[J]. ASTRONOMY & ASTROPHYSICS,2004,415(3):993-1007. |
| APA | Nissen, PE,Chen, YQ,Asplund, M,&Pettini, M.(2004).Sulphur and zinc abundances in Galactic stars and damped Ly alpha systems.ASTRONOMY & ASTROPHYSICS,415(3),993-1007. |
| MLA | Nissen, PE,et al."Sulphur and zinc abundances in Galactic stars and damped Ly alpha systems".ASTRONOMY & ASTROPHYSICS 415.3(2004):993-1007. |
入库方式： OAI收割
来源：国家天文台
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