roAp恒星驱动机制的新亮点。第一部分.金属量的影响
New light on the driving mechanism in roAp stars. Part I. Effects of metallicity
摘要：
观测表明，roAp星脉动的驱动机制与这些恒星中的重元素分布之间存在着某种关系。我们试图研究局部和全局金属丰度变化对A星模型中高阶p模激发机制的影响。我们开发了恒星演化模型来描述不同的全球金属丰度或本地金属积累配置文件的磁性A星。这些模型是用CLES（“Code Liègeois d 'évolution stellaire”）计算的，我们的模型的稳定性是用非绝热振荡代码MAD评估的。我们的模型再现了roAp星不稳定带的蓝色边缘，但产生了一个比观察到的红边热，无论金属丰度。令人惊讶的是，我们发现，在驱动区域内的不透明度的增加可以产生较低的驱动量，我们称之为“逆$κ$ -机制”。
英文摘要：
Observations suggest that a relationship exists between the driving mechanism of roAp star pulsations and the heavy element distribution in these stars. We attempt to study the effects of local and global metallicity variations on the excitation mechanism of high order p-modes in A star models. We developed stellar evolutionary models to describe magnetic A stars with different global metallicity or local metal accumulation profiles. These models were computed with CLES ("Code Liègeois d'évolution stellaire"), and the stability of our models was assessed with the non-adiabatic oscillation code MAD. Our models reproduce the blue edge of the roAp star instability strip, but generate a red edge hotter than the observed one, regardless of metallicity. Surprisingly, we find that an increase in opacity inside the driving region can produce a lower amount of driving, which we refer to as the "inverse $κ$-mechanism".
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