Where is population III
Where is population III
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人口 III 在哪里
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
H. Bond
中科院分区：
文献类型：
--
作者：
H. Bond
一个简单的银晕化学演化的单区模型预测，银晕应该包含大约数量的“族III”恒星(粗略地定义为具有(Fe/H)和lt；-3的恒星)。然而，光晕球状星团、矮球系统和高速亚矮星的无偏样本都显示出统计上显著缺乏具有人口III金属丰度的天体。即使作者和其他人对超低金属丰度的场星进行了广泛的特殊搜索，也未能发现许多可能具有(Fe/H)<；-3的天体。
A simple one-zone model of chemical evolution in the galactic halo predicts that the halo should contain approciable numbers of 'Population III' stars (roughly defined as stars with (Fe/H)<-3). However, unbiased samples of halo globular clusters, dwarf spheroidal systems, and high-velocity subdwarfs all show a statistically significant lack of objects with Population III metallicity. Even extensive special searches for field stars of ultralow metallicity made by the writer and others have failed to reveal more than a very small number of objects that may have (Fe/H)<-3.