Thus, this kind of secondary r-process site seems ruled out by the observations. Recently, the abundance evolution of n-capture elements in metal-poor stars play more and more important and active role in chemical evolution of theGalaxy.

• 由于星系r一过程元素的主要来源为大质量星secondaryr一过程(通过种子核核合成)，核合成区域内种子核和中子源主要来自恒星自身的核反应而不是来自极贫金属星形成时很低的初始丰度，由此可以解释观测到的大量极贫金属星中r过程元素的超丰;