期刊信息
- 刊名： 河北师范大学学报（自然科学版）Journal of Hebei Normal University (Natural Science)
- 主办： 河北师范大学
- ISSN： 1000-5854
- CN： 13-1061/N
- 中国科技核心期刊
- 中国期刊方阵入选期刊
- 中国高校优秀科技期刊
- 华北优秀期刊
- 河北省优秀科技期刊
The Heavy R -process Elements Yields and Abundances Scatter in the Halo of Galaxy
摘要/Abstract
采用Fields等所提出的模型，将超新星爆发产生r-过程元素的事件分为2类:A类(r-rich)事件和B类(r-poor)事件，结合所得到的Ⅱ型超新星r-过程元素的产量和产区，计算了贫金属星较重r-过程元素的弥散，并与观测进行对比分析，解释早期星系化学演化。得到的主要结论:从星系化学演化角度看，星系r-过程元素主要来源于大质量星，r-过程核合成主要产生场所是较高质量的Ⅱ型超新星，质量范围在28M⊙≤M≤35M⊙。利用计算得到的产量及初始质量函数φ(m)，确定产生较重r-过程元素的型超新星占Ⅱ型超新星总数的比例(大约为4%)，计算得到星系晕中Eu，Ba，Ce，La，Nd，Pr，Sm等元素的丰度离散情况;并对计算结果进行分析。
Adopting the classification of Fields 2002, the supernovae event with larger r/ Fe ratio was classified as class A( r -rich event) and those with the lower ratio class B( r -poor event) . Based on the calculation of yields and productive mass range of this paper, the abundance scatter of the heavy r -process elements was calculated and the results were compared with the observation. T he conclusions obtained were as follows: T here was a producing peak of various supernova( 28M P< M < 35M P) for the r -process element yields. T hus, massive stars( i. e. 28MP< M< 35MP) were the primary sites of the r -process nucleosynthesis. T he supernovaes which produced heavy r -process elements originated from a small fraction about 4 % of all Typeò supernovae stars.