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arXiv 2102.10259astro-ph.SR
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穿过赫兹斯普林间隙的快速演化的高振幅$δ$ Scuti星

A rapidly evolving high-amplitude $δ$ Scuti star crossing the Hertzsprung Gap

Jia-Shu Niu, Hui-Fang Xue

摘要:

在这项工作中,我们报告了发现的快速演变的高振幅$δ$ Scuti星KIC 6382916(J19480292+4146558),这是跨越赫兹斯普林间隙。通过对档案资料的分析,发现了三种独立的脉动模式,其振幅和频率在4年内变化明显。前两个振型的线性周期变化率比标准演化理论构造的最佳地震模型大约3-4倍,而第三个振型的线性周期变化率比前两个振型大约8倍。更有趣的是,几乎所有第三模式的组合在频域中具有远离它们的频率峰值$0.0815\ \mathrm{c\ d}^{-1}$。提出了一个框架来解释显着大的频率和振幅变化率的第三模式,在其中我们采用了一种新的脉动模式(共振集成模式)之间的共振产生的径向p模式和非径向混合模式。此外,基于振幅和相位的相互作用图,对三种独立脉动模式及其谐波/组合之间的相互作用进行了全局分析,为今后的星震学研究提供了有用的工具。

英文摘要:

In this work, we report the discovery of the rapidly evolving high-amplitude $δ$ Scuti star KIC 6382916 (J19480292+4146558) which is crossing the Hertzsprung gap. According to the analysis of the archival data, we find three independent pulsation modes, whose amplitudes and frequencies vary distinctly in 4 years. The linear period variation rates of the first two modes are about 3-4 times larger than the best seismic model constructed by the standard evolution theory, while that of the third one is about 8 times larger than the first two modes. What is more interesting is that, almost all the combinations of the third mode have frequency peaks $0.0815\ \mathrm{c\ d}^{-1}$ away from them in the frequency domain. A framework is proposed to interpret the markedly large frequency and amplitude variation rates of the third mode, in which we employ a new pulsation mode (resonating integration mode) generated by the resonance between a radial p-mode and a nonradial mixed mode. Moreover, a global analysis of the interactions between the three independent pulsation modes and their harmonics/combinations is performed based on the interaction diagrams of their amplitudes and phases, which would be a useful tool for the future asteroseismology research.

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