再访CoRoT RR天琴座星：探测倍周期和附加频率的时间变化
Revisiting CoRoT RR Lyrae stars: detection of period doubling and temporal variation of additional frequencies
摘要：
我们在CoRoT RR型天琴座恒星中寻找倍周期的迹象。这种动力学效应在调制型天琴座RR型星中的出现可能有助于我们获得更多关于神秘的Blazhko效应的信息。的时间变化的额外的频率在代表所有亚型的RR天琴座星也进行了研究。我们通过应用趋势和跳跃校正以及离群值去除来预处理CoRoT光变曲线。标准傅立叶技术被用来分析我们的目标的频率内容，并遵循的时间相关的现象。最全面的收集CoRoT RR天琴座恒星，包括新发现的介绍和分析。我们发现交替的最大值，在某些情况下，在四个CoRoT Blazhko RR天琴座恒星的半整数频率，作为倍周期的存在的明显迹象。这进一步证实了倍周期是理解Blazhko效应的一个重要因素--这是我们之前从开普勒RR天琴座样本中得出的一个前提。正如预期的那样，倍周期在大多数调制RRab星中只在很短的时间间隔内才能检测到。我们的研究结果表明，在所有RR天琴座亚型的附加频率的时间变异是无处不在的。这些变化的短暂性和高度可变的幅度表明了一个复杂的基本动力学和复杂的相互作用之间的径向和可能的非径向模式在RR天琴座星。在所有类型的RR天琴座（除了非调制RRab星）中，附加模式无处不在，这意味着在不久的将来，对这些天体进行星震学研究应该是可行的。
英文摘要：
We search for signs of period doubling in CoRoT RR Lyrae stars. The occurrence of this dynamical effect in modulated RR Lyrae stars might help us to gain more information about the mysterious Blazhko effect. The temporal variability of the additional frequencies in representatives of all subtypes of RR Lyrae stars is also investigated. We pre-process CoRoT light curves by applying trend and jump correction and outlier removal. Standard Fourier technique is used to analyze the frequency content of our targets and follow the time dependent phenomena. The most comprehensive collection of CoRoT RR Lyrae stars, including new discoveries is presented and analyzed. We found alternating maxima and in some cases half-integer frequencies in four CoRoT Blazhko RR Lyrae stars, as clear signs of the presence of period doubling. This reinforces that period doubling is an important ingredient to understand the Blazhko effect - a premise we derived previously from the Kepler RR Lyrae sample. As expected, period doubling is detectable only for short time intervals in most modulated RRab stars. Our results show that the temporal variability of the additional frequencies in all RR Lyrae sub-types is ubiquitous. The ephemeral nature and the highly variable amplitude of these variations suggest a complex underlying dynamics of and an intricate interplay between radial and possibly nonradial modes in RR Lyrae stars. The omnipresence of additional modes in all types of RR Lyrae - except in non-modulated RRab stars - implies that asteroseismology of these objects should be feasible in the near future (Abridged).
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