Pulsations of rapidly rotating stars II. Realistic modelling for intermediate-mass stars
Pulsations of rapidly rotating stars II. Realistic modelling for intermediate-mass stars
复制标题
快速旋转恒星的脉动 II.
DOI：
10.1051/0004-6361/201525734
复制
发表时间：
2015
影响因子：
6.5
通讯作者：
Ouazzani R
中科院分区：
文献类型：
--
作者：
Ouazzani R
上下文。非常高精度的地震空间任务，如CoRoT和开普勒，为测试恒星内部传输过程的模型提供了手段。对于一些恒星，如δ Scuti， γ Doradus和Be星，观测到的脉动光谱被旋转修改到这样的程度，以至于无法进行有效的解释。目标。我们的目标是表征真实恒星模型的声脉动光谱，以便能够解释来自此类恒星的星震数据。方法。以非摄动方式处理旋转的二维振荡代码ACOR用于研究高度畸变的恒星演化模型的脉动谱。二维恒星模型是通过一种自洽方法获得的，该方法在任何演化阶段和任何类型的旋转规律下，都会对球面平均恒星模型进行事后扭曲。结果。在一个非常密集的频谱中计算了四种模态，其中包括岛模态。岛模谱的规律性得到了证实，并得到了一组新的量子数，利用这些量子数可以建立一个可变的模数图。本文首次在快速旋转模型中计算了重力声混合模态。
Context. Very high precision seismic space missions such as CoRoT and Kepler provide the means for testing the modelling of transport processes in stellar interiors. For some stars, such as δ Scuti, γ Doradus, and Be stars, the observed pulsation spectra are modified by rotation to such an extent that it prevents any fruitful interpretation. Aims. Our aim is to characterise acoustic pulsation spectra of realistic stellar models in order to be able to interpret asteroseismic data from such stars. Methods. The 2D oscillation code ACOR, which treats rotation in a non-perturbative manner, is used to study pulsation spectra of highly distorted evolved models of stars. Two-dimensional models of stars are obtained by a self-consistent method that distorts spherically averaged stellar models a posteriori, at any stage of evolution, and for any type of rotation law. Results. Four types of modes are calculated in a very dense frequency spectrum, among which are island modes. The regularity of the island modes spectrum is confirmed and yields a new set of quantum numbers, with which an échelle diagram can be built. Mixed gravito-acoustic modes are calculated in rapidly rotating models for the first time.