Chemical composition of stars in the galactic halo
文献类型：期刊论文
| 作者 | Ermakov, SV; Klochkova, VG; Panchuk, VE; Zhao, G
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| 刊名 | ASTRONOMY REPORTS
 |
| 出版日期 | 2002-11-01 |
| 卷号 | 46期号:11页码:874-886 |
| 英文摘要 | The chemical compositions of the atmospheres of six metal-poor stars are analyzed. Spectra with signal-to-noise ratios of no less than 100 and a resolution of R; 17 000 were obtained using the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences. The abundances of Li, O, alpha-process elements (Mg, Si, Ca, Ti), Na, K, Sc, iron-peak elements (Cr, Mn, Fe, Ni, Cu, Zn), and s-process elements (Y, Ba) are derived. The star G251-54 ([fe/H] = -1.55, T-eff = 5541 K, log g = 3.58) is deficient in some elements compared to both stars with similar metallicities and the Sun. The atmosphere of G251-54 has the following elemental abundances relative to iron: [O/Fe] = +0.47, [alpha/Fe] approximate to -0.3, [Na/Fe] = -0.60, [Sc/Fe] = -0.57, [Cr, Ni, Fe] approximate to 0, [Zn/Fe] +0.16, [Cu/Fe] = -0.66, [Y/Fe] = -0.70, and [Ba/Fe] = -1.35, The remaining five stars have metallicities in the range -1.6 < [Fe/H] < -1.3 and normal abundances for this metallicity interval and are used as reference stars for comparison with the chemical composition of G251-54. Possible explanations for deviations of the abundances of some elements from the mean relations established for halo objects are discussed. (C) 2002 MAIK "Nauka/Interperiodica". |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000179506900003 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8627]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Russian Acad Sci, Special Astrophys Observ, Cherkessiya Republ 357147, Russia 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ermakov, SV,Klochkova, VG,Panchuk, VE,et al. Chemical composition of stars in the galactic halo[J]. ASTRONOMY REPORTS,2002,46(11):874-886. |
| APA | Ermakov, SV,Klochkova, VG,Panchuk, VE,&Zhao, G.(2002).Chemical composition of stars in the galactic halo.ASTRONOMY REPORTS,46(11),874-886. |
| MLA | Ermakov, SV,et al."Chemical composition of stars in the galactic halo".ASTRONOMY REPORTS 46.11(2002):874-886. |
入库方式： OAI收割
来源：国家天文台
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