A search for metal-poor stars pre-enriched by pair-instability supernovae I. A pilot study for target selection from Sloan Digital Sky Survey
文献类型：期刊论文
| 作者 | Ren, Jing1,2,3 ; Christlieb, Norbert2; Zhao, Gang1,2,3
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| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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| 出版日期 | 2012-12-01 |
| 卷号 | 12期号:12页码:1637-1648 |
| 关键词 | stars: Population II, Population III stars: supernovae (PISNe) stars: abundance stars: chemically peculiar method: data analysis techniques: spectroscopic instrumentation: spectrographs |
| 英文摘要 | We report on a pilot study on identifying metal-poor stars pre-enriched by Pair-Instability Supernovae (PISNe). Very massive, first generation (Population III) stars (140 M-circle dot <= M <= 260 M-circle dot) end their lives as PISNe, which have been predicted by theories, but no relics of PISNe have been observed yet. Among the distinct characteristics of the yields of PISNe, as predicted by theoretical calculations, are a strong odd-even effect, and a strong overabundance of Ca with respect to iron and the solar ratio. We use the latter characteristic to identify metal-poor stars in the Galactic halo that have been pre-enriched by PISNe, by comparing metallicites derived from strong, co-added Fe lines detected in low-resolution (i.e., R = lambda/Delta lambda similar to 2000) spectra of the Sloan Digital Sky Survey (SDSS), with metallicities determined by the SDSS Stellar Parameters Pipeline (SSPP). The latter are based on the strength of the Ca II K line and assumptions on the Ca/Fe abundance ratio. Stars are selected as candidates if their metallicity derived from Fe lines is significantly lower than the SSPP metallicities. In a sample of 12 300 stars for which SDSS spectroscopy is available, we have identified 18 candidate stars. Higher resolution and signal-to-noise ratio spectra of these candidates are being obtained with the Very Large Telescope of the European Southern Observatory and the XSHOOTER spectrograph, to determine their abundance patterns, and to verify our selection method. We plan to apply our method to the database of several million stellar spectra to be acquired with the Guo Shou Jing Telescope (LAMOST) in the next five years. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000313011000005 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6203]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Shandong Univ, Sch Space Sci & Phys, Weihai 264209, Peoples R China 2.Heidelberg Univ, Zentrum Astron, Landessternwarte, D-69117 Heidelberg, Germany 3.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ren, Jing,Christlieb, Norbert,Zhao, Gang. A search for metal-poor stars pre-enriched by pair-instability supernovae I. A pilot study for target selection from Sloan Digital Sky Survey[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2012,12(12):1637-1648. |
| APA | Ren, Jing,Christlieb, Norbert,&Zhao, Gang.(2012).A search for metal-poor stars pre-enriched by pair-instability supernovae I. A pilot study for target selection from Sloan Digital Sky Survey.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,12(12),1637-1648. |
| MLA | Ren, Jing,et al."A search for metal-poor stars pre-enriched by pair-instability supernovae I. A pilot study for target selection from Sloan Digital Sky Survey".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 12.12(2012):1637-1648. |
入库方式： OAI收割
来源：国家天文台
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