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We present the first observations of extragalactic pulsating stars in the K2ecliptic survey of the Kepler space telescope. Variability of all three RRLyrae stars in the dwarf spheroidal galaxy Leo IV were successfully detected,at a brightness of Kp~21.5 mag, from data collected during Campaign 1. Weidentified one modulated star and another likely Blazhko candidate with periodsof 29.8+-0.9 d and more than 80 d, respectively. EPIC 210282473 represents thefirst star beyond the Magellanic Clouds for which the Blazhko period andcycle-to-cycle variations in the modulation were unambiguously measured.Thephotometric [Fe/H] indices of the stars agree with earlier results that Leo IVis a very metal-poor galaxy. Two out of three stars blend with brighterbackground galaxies in the K2 frames. We demonstrate that image subtraction canbe reliably used to extract photometry from faint confused sources that will becrucial not only for the K2 mission but for future space photometric missionsas well.

Pushing the limits, episode 2: K2 observations of extragalactic RR Lyrae stars in the dwarf galaxy Leo IV