Review of candidates of binary systems with an RR Lyrae component

Abstract

We present an overview and current status of research on RR Lyrae stars in binary systems. In present days the number of binary candidates has steeply increased and suggested that multiple stellar systems with an RR Lyrae component is much higher than previously thought. We discuss the probability of their detection using various observing methods, compare recent results regarding selection effects, period distribution, proposed orbital parameters and the Blazhko effect.

4 pages, 2 figures, proceedings of RRL2015 - High-Precision Studies of RR Lyrae Stars, to appear in the Communications from the Konkoly Observatory of the Hungarian Academy of Sciences