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Although roughly half of all stars are considered to be part of binary ormultiple systems, there are only two confirmed cases of RR Lyrae pulsators withcompanions. One of them is TU Uma (Wade et al 1999) - a classical RR Lyrae starin a very eccentric orbit - and the other is OGLE-BLG-RRLYR-02792 (Pietrzynskiet al 2012). Considering the wealth of well-studied RR Lyrae stars, this numberis astoundingly low. Having more RR Lyrae stars in binary systems at hand wouldbe extremely valuable to get independent measurements of the masses. The datafrom the Kepler mission with their unprecedented precision and the long timespan of about four years offer a unique possibility to systematically searchfor the signatures of binarity in RR Lyrae stars. Using the pulsation as aclock, we studied the variations in the timing of maximum light to hunt forpossible binary systems in the sample.

A search for binary candidates among the fundamental mode RR Lyrae stars observed by Kepler