低质量双子星演化为铅星的物理条件

The Physical Condition of Low-mass Binary Stars Evolved into Lead-Stars

将TP-AGB星辐射s-过程核合成模型与双星系统星风吸积模型的轨道根数变化方程相结合,采用逐次脉冲吸积质量与混合的方法,对大量低质量双星系统进行演化计算,统计外赋AGB星形成铅星的分布规律。计算结果表明,双星系统的轨道周期、内禀AGB星的初始金属丰度及初始质量是影响外赋AGB演化为铅星的三个重要因素。

Combining the scenario of TP-AGB stars radiative s-process nucleosynthesis and the change equations of the Binary stars wind accretion model orbital elements, using the method of pulse mass accretion and mixture one time after anther, we calculate the evolution process of large numbers of Low-mass Binary stars and count the distributed rules of extrinsic AGB stars evolved into Lead-stars. The calculation indicates that the orbital periods of binary stars, the original metallicities and the initial masses of intrinsic AGB stars are the three primary factors that affect the evolution of extrinsic AGB stars into Lead-stars.