Lithium Abundance of Metal-poor Stars
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)/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).
作 者： Hua-Wei Zhang Gang Zhao 作者单位： Hua-Wei Zhang(National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012;Department of Astronomy, School of Physics, Peking University, Beijing 100871;Chinese Academy of Sciences-Peking University Joint Beijing Astrophysical Center, Beijing 100871)Gang Zhao(National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012)
刊 名： 天体物理学报(英文版) ISTIC SCI 英文刊名： CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 年，卷(期)： 2003 3(5) 分类号： P14 关键词： stars: abundances - stars: Population Ⅱ - Galaxy: evolution