标题： 变率的风味：用开普勒望远镜观测的29颗RR_lyrae星 显示英文标题

标题： Flavours of variability: 29 RR Lyrae stars observed with Kepler

摘要： 我们基于138天的观测数据，分析了开普勒卫星对29颗造父变星（RR Lyrae stars）的观测结果。我们报告了所有恒星精确的脉动周期。其中九颗恒星在文献中的周期要么错误要么未知。在这14颗恒星中，既有振幅调制又有相位调制布拉兹科效应，布拉兹科周期范围从27.7天到超过200天。对于V445 Lyr，除了其53.2天的布拉兹科周期外，还观察到了一个更长的次级变化。开普勒测光的前所未有的精度导致了迄今为止发现的最小调制的发现。此外，还发现了超越已知谐波和布拉兹科多重频率的额外频率。这些频率至少在三颗恒星中位于主脉动频率的半整数倍附近。在四颗恒星中，这些频率接近第一和/或第二过调模式。这些周期性振幅似乎在布拉兹科循环中发生变化。V350 Lyr是我们样本中一颗非布拉兹科效应恒星，它是首次发现的一颗双模态造父变星，以基模和第二过调模式振动。 显示英文摘要

摘要： We present our analysis of Kepler observations of 29 RR Lyrae stars, based on 138-d of observation. We report precise pulsation periods for all stars. Nine of these stars had incorrect or unknown periods in the literature. Fourteen of the stars exhibit both amplitude and phase Blazhko modulations, with Blazhko periods ranging from 27.7 to more than 200 days. For V445 Lyr, a longer secondary variation is also observed in addition to its 53.2-d Blazhko period. The unprecedented precision of the Kepler photometry has led to the discovery of the the smallest modulations detected so far. Moreover, additional frequencies beyond the well-known harmonics and Blazhko multiplets have been found. These frequencies are located around the half-integer multiples of the main pulsation frequency for at least three stars. In four stars, these frequencies are close to the first and/or second overtone modes. The amplitudes of these periodicities seem to vary over the Blazhko cycle. V350 Lyr, a non-Blazhko star in our sample, is the first example of a double mode RR Lyrae star that pulsates in its fundamental and second overtone modes.