双臂形变晶体圆盘振荡的共振激发及其在高频QPO中的应用
Resonant Excitation of Disk Oscillations in Two-Armed-Deformed Disks and Application to High-Frequency QPOs
摘要：
在以前的论文中，我们证明了在单臂变形盘中，p模和g模振荡是由水平共振激发的，并将其应用于在低质量X射线双星中观察到的高频QPO。在该模型中，所观察到的kHz QPO的时间变化被认为是变形的时间依赖性进动的结果。在本文中，我们考虑另一种可能的原因的kHz QPO的时间变化。也就是说，我们证明，在双臂变形磁盘，p-模式和g-模式振荡激发{ \it垂直共振}，而不是由水平共振（水平共振阻尼它们）。此外，我们表明，在垂直共振的情况下，如果垂直盘结构随时间变化，激发的磁盘振荡的频率可以随时间而变化。一个简单的应用程序，这些结果的时间变化所观察到的kHz QPO。
英文摘要：
In previous papers we showed that in a one-armed deformed disks, p-mode and g-mode oscillations are resonantly excited by horizontal resonance, and applied it to high frequency QPOs observed in low mass X-ray binaries. In that model, the observed time variation of kHz QPOs is regarded as a result of a time-dependent precession of the deformation. In this paper we consider another possible cause of time variation of kHz QPOs. That is, we demonstrate that in a two-armed deformed disks, p-mode and g-mode oscillations are excited by {\it vertical resonance}, not by horizontal resonance(horizontal resonance dampens them). Furthermore, we show that in the case of vertical resonance, the frequencies of disk oscillations excited can vary with time if vertical disk structure changes with time. A brief application of these results to the time variation of observed kHz QPOs is made.
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