| Lithium Abundance of Metal－poor Stars |
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| 作者姓名： | Hua-Wei Zhang and Gang Zhao
National Astronomical Observatories Chinese Academy of Sciences Beijing |
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| 作者单位： | Hua-Wei Zhang and Gang Zhao
1 National Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012;
2 Department of Astronomy，School of Physics，Peking University，Beijing 100871
3 Chinese Academy of Sciences-Peking University Joint Beijing Astrophysical Center，Beijing 100871 |
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| 基金项目： | Supported by the National Natural Science Foundation of China |
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| 摘 要： | High-resolution, high signal-to-noise ratio spectra have been obtained for 32 metal-poor stars. The equivalent widths of Li A6708 A were measured and the lithium abundances were derived. The average lithium abundance of 21 stars on the lithium plateau is 2.33±0.02 dex. The Lithium plateau exhibits a marginal trend along metallicity, dA(Li)/dFe/H] ?0.12±0.06, and no clear trend with the effective temperature. The trend indicates that the abundance of lithium plateau may not be primordial and that a part of the lithium was produced in Galactic Chemical Evolution (GCE).
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| 关 键 词： | 金属星 锂 GCE 银河化学演变 Metal-poor恒星 星族Ⅱ |
Lithium Abundance of Metal-poor Stars |
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| Hua-Wei Zhang and Gang Zhao
National Astronomical Observatories,Chinese Academy of Sciences,Beijing ,
.Lithium Abundance of Metal-poor Stars[J].Chinese Journal of Astronomy and Astrophysics,2003,3(5):453-457. |
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| Authors: | Hua-Wei Zhang Gang Zhao |
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| Abstract: | High-resolution, high signal-to-noise ratio spectra have been obtained for 32 metal-poor stars. The equivalent widths of Li λ6708A were measured and the lithium abundances were derived. The average lithium abundance of 21 stars on the lithium plateau is 2.33±0.02 dex. The Lithium plateau exhibits a marginal trend along metallicity, dA(Li)/dFe/H] = 0.12±0.06, and no clear trend with the effective temperature. The trend indicates that the abundance of lithium plateau may not be primordial and that a part of the lithium was produced in Galactic Chemical Evolution (GCE). |
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| Keywords: | stars: abundances - stars: Population II - Galaxy: evolution |
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