摘要
以１３Ｃ（α，ｎ）１６Ｏ及２２Ｎｅ（α，ｎ）２５Ｍｇ作为双脉冲中子源，对于低质量ＡＧＢ星，采用无分叉ｓ－过程反应通道，结合最近恒星演化的计算结果，在各物理参量合理取值范围内，计算了ＡＧＢ星Ｈｅ壳层内、表面重核素的丰度，在此基础上将星风吸积模型同内禀ＡＧＢ星核合成模型结合起来计算外赋ＡＧＢ星重元素的超丰；以此为丰度初始条件。
The 13 C (α,n) 16 O and the 22 Ne(α,n) 25 Mg are used as the recurrent pulses neutron source,and a nonbranched sprocess reactive network is adopted for low mass AGB stars in combination with the recent calculation results of stellar evolution,the abundances of the surface heavy nuclide in the Heshell and envelope of AGB stars are calculated in the range of relational value of each physicsparameter.On the basis of this,the excess abundances of the heavy elements of extrinsic AGB stars are calculated by the combination of wind accretion model with the nucleosynthesis model of intrinsic AGB stars,and the evolutions of heavy nuclide abundance of the reborn AGB stars are calculated by use of this as the original condition of abundance.
基金
国家自然科学基金
关键词
AGB星
核合成
再生AGB星
丰度
重核素
天体化学
intrinsic AGB stars
nuclcosynthesis
extrinsic AGB stars
wind accretion
reborn AGB stars
abundance
