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arXiv 0801.4630astro-ph
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快速旋转恒星的声谱中的规则图案

Regular patterns in the acoustic spectrum of rapidly rotating stars

D. Reese, F. Lignières, M. Rieutord

摘要:

背景:快速旋转改变了脉动恒星的频谱结构,从而使模式识别变得困难。目的:我们寻找新的组织形式的频谱,可以提供一个基础的模式识别在高转速。研究方法:均匀旋转多方模型的恒星的声学模式计算使用的数值代码,充分考虑到旋转(离心畸变和科里奥利加速度)的影响。所有低阶模式,l=0到3,对于N=3多变模型,径向阶数n=1-10和21-25,对于N=1.5多变模型,径向阶数n=1-10,从零旋转速率到59%的分裂速度。结果如下:我们找到了一个经验公式,给出了一个很好的描述的高频范围内的高转速的计算声谱。这个公式和完整的本征模计算之间的差异被证明是大大小于在低转速下有效的三阶微扰方法获得的。

英文摘要:

Context: Rapid rotation modifies the structure of the frequency spectrum of pulsating stars, thus making mode identification difficult. Aims: We look for new forms of organisation for the frequency spectrum that can provide a basis for mode identification at high rotation rates. Methods: Acoustic modes in uniformly rotating polytropic models of stars are computed using a numerical code that fully takes the effects of rotation (centrifugal distortion and Coriolis acceleration) into account. All low-degree modes, l=0 to 3, with radial orders n=1-10 and 21-25 for N=3 polytropic models and n=1-10 for N=1.5 polytropic models are followed from a zero rotation rate up to 59 % of the break-up velocity. Results: We find an empirical formula that gives a good description of the high-frequency range of the computed acoustic spectrum for high rotation rates. Differences between this formula and complete eigenmode calculations are shown to be substantially smaller than those obtained with a third order perturbative method valid at low rotation rates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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