使用TAROT望远镜进行的全天空RR Lyr巡天。Blazhko效应分析
The all-sky GEOS RR Lyr survey with the TAROT telescopes. Analysis of the Blazhko effect
摘要：
我们使用GEOS数据库来研究银河系RRab星的Blazhko效应。业余天文学家提供的最大值和两台TAROT机器人望远镜进行的专门调查不断丰富数据库。在脉动周期的不同值处观察到相同的Blazhko周期值，并且在脉动周期的相同值处观察到不同的Blazhko周期值。有线索表明，Blazhko效应正在从一个周期到下一个周期发生变化。ZCVn的脉动周期和Blazhko周期的长期变化是相互关联的。幅值与最大值相位的关系图清楚地表明，Blazhko变星的光变曲线可以解释为振幅和频率的调制信号。在这些图中描述Blazhko周期的闭合曲线具有不同的形状，反映了最亮极大值和最大O-C的时期之间的相移。我们的例子表明，顺时针方向和逆时针方向都可能为类似的形状。除了光变曲线的一些特殊性之外，对布拉日科效应的观测知识的改进仍然需要通过令人满意的物理机制来解释。
英文摘要：
We used the GEOS database to study the Blazhko effect of galactic RRab stars. The database is continuously enriched by maxima supplied by amateur astronomers and by a dedicated survey by means of the two TAROT robotic telescopes. The same value of the Blazhko period is observed at different values of the pulsation periods and different values of the Blazhko periods are observed at the same value of the pulsation period. There are clues suggesting that the Blazhko effect is changing from one cycle to the next. The secular changes in the pulsation and Blazhko periods of Z CVn are anticorrelated. The diagrams of magnitudes against phases of the maxima clearly show that the light curves of Blazhko variables can be explained as modulated signals, both in amplitude and in frequency. The closed curves describing the Blazhko cycles in such diagrams have different shapes, reflecting the phase shifts between the epochs of the brightest maximum and the maximum O-C. Our sample shows that both clockwise and anticlockwise directions are possible for similar shapes. The improved observational knowledge of the Blazhko effect, in addition to some peculiarities of the light curves, have still to be explained by a satisfactory physical mechanism.
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