中子俘获元素丰度与较轻元素丰度的天体物理关联研究

恒星中子俘获元素和较轻元素丰度分布及丰度趋势中蕴含了丰富的中子俘获核合成与星系化学演化的信息。本项目将在对大量各种金属丰度恒星元素丰度观测资料分类整理、全面分析比较的基础上，采用叠加与分解的方法，通过对中子俘获元素丰度及丰度趋势与较轻元素丰度的天体物理关联研究，得到更多与主要r-过程、弱r-过程、弱s-过程及i-过程密切相关的核合成信息，形成关于中子俘获核合成场所及物理条件研究的观测约束链条。将所得结果与恒星演化计算结果及中子俘获核合成计算结果进行详细对比，确定主要r-过程和弱r-过程的相关物理条件及核合成场所，探究CEMP-r/s星中“r-过程元素”的天体物理来源，研究弱s-过程核合成的金属丰度依赖关系并在贫金属星中寻找primary弱s-过程的踪迹，解决一些关于中子俘获核合成及星系化学演化的重要问题。

The element abundance paterns and the abundance trends of the neutron-capture elements and light elements in the stars contain the abundant informations about the neutron-capture nucleosynthesis and the Galactic chemical evolution. In this project,based on the classifications and detailed analysis of the the the observed elements abundance of the stars with various metallicity, we will study the astrophysical relationship between the abundances of the neutron-capture elements and the lighter elements to find the more nucleosynthesis informations about the main r-,weak r-,main-s,weak s- process and i-process, by means of the superposition and the decomposition of the element abundances. Furthmore, the contrait chains about the astrophysical sites and physical conditions of the neutron-capture processes can be derived. We will compare the contraits with the calculated results of the stellar evolution and the the neutron-capture nucleosynthesis to determine the astrophysical sites and the physical conditions of the r- process. We will also investigate the astrophysical origins of the r- process elements in CEMP-r/s stars, study the metallicity-dependency of the weak s-process yields and explore trace of primary weak s-process nucleosynthesis, which can promote us to better understand the neutron-capture nucleosynthesis and solve some important problems about the Galactic chemical evolution.