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We report the discovery of an RR Lyrae star that experienced a switching ofits pulsation mode. OGLE-BLG-RRLYR-12245 was discovered as a double-mode RRdstar from the observations conducted in years 2001-2006 during the third phaseof the Optical Gravitational Lensing Experiment (OGLE-III). The OGLE-IVobservations carried out since 2010 reveal that this object is now afundamental-mode RRab star, with no sign of the first-overtone pulsation. Theanalysis of the OGLE photometry shows that the final stage of the modeswitching occurred on a relatively short timescale of a few months in 2005. Westudy the behavior of the star during this process, showing changes of thepulsational amplitudes and periods. We also discuss possible causes for themode switching in RR Lyr stars.

OGLE-BLG-RRLYR-12245: An RR Lyrae Star that Switched from a Double- to Single-mode Pulsation