Nuclei in the Cosmos XV
Nuclei in the Cosmos XV
复制标题
宇宙中的原子核 XV
DOI：
10.1007/978-3-030-13876-9_71
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Kaiser E
中科院分区：
文献类型：
--
作者：
Kaiser E
对流在恒星演化中起着关键作用，因为它具有能量传输和成分混合的作用。尽管它很重要，但这个过程仍然没有得到很好的理解。在所有一维恒星演化代码中，一个长期存在的难题是对流边界的处理。在这项研究中，我们比较了两个对流不确定性，边界位置(Ledoux和Schwarzschild)和额外混合量，以及它们对大质量恒星早期演化的影响。随着对流边界混合(CBM)的增加，我们发现两个不同边界位置的辐合，蓝红超巨星比减小，半对流的重要性降低。
Convection plays a key role in the evolution of stars due to energy transport and mixing of composition. Despite its importance, this process is still not well understood. One longstanding conundrum in all 1D stellar evolution codes is the treatment of convective boundaries. In this study we compare two convective uncertainties, the boundary location (Ledoux versus Schwarzschild) and the amount of extra mixing, and their impact on the early evolution of massive stars. With increasing convective boundary mixing (CBM), we find a convergence of the two different boundary locations, a decreasing blue to red super giant ratio and a reduced importance of semiconvection.