BVRc light curves of 5 CoRoT RR Lyrae stars

High-precision, space-based photometric missions like CoRoT and Kepler have revealed new and surprising phenomena in classical variable stars. Such discoveries were the period doubling in RR Lyrae stars and the frequent occurrence of additional periodicities some of which can be explained by radial overtone modes, but others are discordant with the radial eigenfrequency spectrum. 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.

高精度、基于空间的光度测量任务，如 CoRoT 和 Kepler，在经典变星领域揭示了新的、令人惊讶的现象。此类发现包括 RR Lyrae 星的周期加倍现象，以及频繁出现的额外周期性，其中一些可以通过径向泛音模态进行解释，但其他则与径向本征频率谱不协调。我们致力于寻找 CoRoT RR Lyrae 星周期加倍现象的迹象。这种动力学效应在调制 RR Lyrae 星中的出现可能有助于我们深入了解神秘的 Blazhko 现象。同时，还研究了 RR Lyrae 星各亚型代表中额外频率的时间变化性。