The Blazhko Effect in RR Lyrae stars: Strong observational support for the oblique pulsator model in three stars

The MACHO Collaboration, C. Alcock, D. R. Alves +17

Using the novel data set of the MACHO project, we show that three ``Blazhko Effect'' RR Lyrae stars show nearly-pure amplitude modulation of a single pulsation mode. This is strong…