论文标题
使用MESA与预测混合和对流预混合方案对Subdwarf B恒星的进化建模
Evolutionary modelling of subdwarf B stars using MESA with the predictive mixing and convective premixing schemes
论文作者
论文摘要
提出了细分B恒星进化建模的结果。我们首次使用台面代码中可用的新算法：预测混合方案和对流预混合方案中可用的新算法探索核心和近核混合。我们展示了这两种方法如何处理对流边界的确定，从星空学和进化模型获得的核心质量之间的差异以及与核心燃烧阶段有关的长期存在的问题，例如对流核心的分裂以及呼吸脉动的发生。我们发现对流预混合方案是可取的算法。在预测性混合以及在对流预混合方案的情况下，对流核心的质量以及对流和半感染区的组合要高于仅具有Ledoux标准的模型，但它们仍然低于地震源性值。两种算法都是研究细分B恒星模型的有前途和替代方法。
Results of evolutionary modelling of subdwarf B stars are presented. For the first time, we explore the core and near-core mixing in the subdwarf B stars using new algorithms available in the MESA code: the predictive mixing scheme and the convective premixing scheme. We show how both methods handle the problems with determination of convective boundary, discrepancy between core masses obtained from asteroseismology and evolutionary models, and long-standing problems related to the core-helium-burning phase such as splitting of the convective core and the occurrence of breathing pulses. We find that the convective premixing scheme is the preferable algorithm. The masses of the convective core in case of the predictive mixing and the combined convective and semiconvective regions in case of the convective premixing scheme are higher than in the models with only the Ledoux criterion, but they are still lower than the seismic-derived values. Both algorithms are promising and alternative methods of studying models of subdwarf B stars.
