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arXiv 1208.4908astro-ph.SR
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RR天琴座的非线性星震学

Nonlinear asteroseismology of RR Lyrae

L. Molnár, Z. Kolláth, R. Szabó, K. Kolenberg, S. Bryson, F. Mullally, S. E. Thompson

摘要:

开普勒太空望远镜的观测显示,基模天琴座RR型星可能会显示出各种径向泛音。多个径向模式的存在可能使我们能够进行非线性星震学:比较模式振幅和观测和模型之间的频移。在这里,我们报告的检测三个径向模式的恒星RR天琴座,eponym的类,使用开普勒短节奏的数据:除了基本模式,第一和第九泛音可以来自数据集。RR Lyrics显示倍周期,但偶尔切换到六个脉动周期重复而不是两个的模式的状态。我们发现流体动力学模型,显示相同的三种模式和周期六状态,允许与观察比较。

英文摘要:

The observations of the Kepler space telescope revealed that fundamental-mode RR Lyrae stars may show various radial overtones. The presence of multiple radial modes may allow us to conduct nonlinear asteroseismology: comparison of mode amplitudes and frequency shifts between observations and models. Here we report the detection of three radial modes in the star RR Lyr, the eponym of the class, using the Kepler short cadence data: besides the fundamental mode, both the first and the ninth overtones can be derived from the data set. RR Lyrae shows period doubling, but switches occasionally to a state where a pattern of six pulsation cycles repeats instead of two. We found hydrodynamic models that show the same three modes and the period-six state, allowing for comparison with the observations.

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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