贫金属星重元素丰度的研究

Neutron capture element abundances distribution in metal-poor stars

以重元素观测丰度为约束,本文研究三种核合成过程对贫金属星重元素丰度的贡献.结果表明:金属丰度越高的恒星,主要s-过程对重元素丰度的贡献就越大,弱s-过程、r-过程对重元素丰度的贡献就越小;金属丰度越低的恒星,主要s-过程对中子俘获元素丰度的贡献越小,中子俘获元素丰度的贡献主要来自于r-过程.

Based on the observed data of three typical elements abundances,in metal-poor stars the observed constraints on the theory of stellar nucleosynthesis of heavy elements and chemical evolution of galaxies are researched in this paper.The resulsts show that the higher the metallicities is the bigger the main s-process contribution is to heavy-elements abundance in metal-poor stars.The lower the metallicities is the bigger the r-process contribution is to heavy-elements abundance in metal-poor stars.The process mainly contributes to neatron capture heavy-elements abundance in metal-poor stars.