Lithium in halo stars from standard stellar evolution
Lithium in halo stars from standard stellar evolution
复制标题
标准恒星演化中晕恒星中的锂
DOI：
10.1086/191439
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发表时间：
1990
影响因子：
8.7
通讯作者：
S. Kawaler
中科院分区：
文献类型：
--
作者：
C. Deliyannis;P. Demarque;S. Kawaler
建立了低金属量恒星模型从主序到巨分支相的理论演化序列网格。该网格用于研究标准恒星演化过程中表面锂丰度的历史。本文综合了Spite和Spite（1982）对晕星Li-7的观测以及随后的观测结果，按年龄对晕星进行了分类。表面锂丰度的理论说明以下的参考晕星星模型从收缩完全对流premain序列的巨大分支阶段的演变。理论模型与观测到的锂丰度进行了比较。结果表明，晕星星锂丰度可以在标准恒星演化理论的背景下使用完全标准的假设和物理解释。参考文献145篇。
A grid has been constructed of theoretical evolution sequences of models for low-metallicity stars from the premain-sequence to the giant branch phases. The grid is used to study the history of surface Li abundance during standard stellar evolution. The Li-7 observations of halo stars by Spite and Spite (1982) and subsequent observations are synthesized to separate the halo stars by age. The theory of surface Li abundance is illustrated by following the evolution of a reference halo star model from the contracting fully convective premain sequence to the giant branch phase. The theoretical models are compared with observed Li abundances. The results show that the halo star lithium abundances can be explained in the context of standard stellar evolution theory using completely standard assumptions and physics. 145 refs.