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《中国天文和天体物理学报(英文版)》 2003-05
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Lithium Abundance of Metal-poor Stars

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  
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)/d[Fe/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).
【Fund】: Supported by the National Natural Science Foundation of China
【CateGory Index】: P152
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