Domains of pulsational instability of low-frequency modes in rotating upper main sequence stars
Domains of pulsational instability of low-frequency modes in rotating upper main sequence stars
复制标题
旋转上部主序星低频模式脉动不稳定性域
DOI：
10.1093/mnras/stx738
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发表时间：
2017
影响因子：
4.8
通讯作者：
J. Daszy'nska
中科院分区：
文献类型：
--
作者：
W. Szewczuk;J. Daszy'nska
我们在赫茨普龙-罗素图上确定了质量为2-20的旋转主序星的不稳定域。科里奥利力的影响是在传统近似的框架内处理的。考虑了调和度$\ well $达4的高阶g模和$| $达4的混合重力-罗斯比模。考虑到旋转的影响，在给定的$\ \ well $中，与非旋转的情况相比，会产生更宽的不稳定带，并将脉动不稳定性扩展到更热、更大质量的模型中。我们给出了初始旋转速度的固定值以及角旋转频率与其临界值的固定比值的结果。此外，我们还检查了初始氢丰度，金属丰度，对流核的超调和不透明度数据如何影响脉动不稳定域。讨论了旋转对周期间距的影响。
We determine instability domains on the Hertzsprung-Russel diagram for rotating main sequence stars with masses 2-20 $\mathrm M_\odot$. The effects of the Coriolis force are treated in the framework of the traditional approximation. High-order g-modes with the harmonic degrees, $\ell$, up to 4 and mixed gravity-Rossby modes with $|m|$ up to 4 are considered. Including the effects of rotation results in wider instability strips for a given $\ell$ comparing to the non-rotating case and in an extension of the pulsational instability to hotter and more massive models. We present results for the fixed value of the initial rotation velocity as well as for the fixed ratio of the angular rotation frequency to its critical value. Moreover, we check how the initial hydrogen abundance, metallicity, overshooting from the convective core and the opacity data affect the pulsational instability domains. The effect of rotation on the period spacing is also discussed.