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The CoRoT (Convection, Rotation and planetary Transits) space missionprovides a valuable opportunity to monitor stars with uninterrupted timesampling for up to 150 days at a time. The study of RR Lyrae stars, performedin the framework of the Additional Programmes belonging to the exoplanetaryfield, will particularly benefit from such dense, long-duration monitoring. TheBlazhko effect in RR Lyrae stars is a long-standing, unsolved problem ofstellar astrophysics. We used the CoRoT data of the new RR Lyrae variable CoRoT101128793 (f0=2.119 c/d, P=0.4719296 d) to provide us with more detailedobservational facts to understand the physical process behind the phenomenon.The CoRoT data were corrected for one jump and the long-term drift. We applieddifferent period-finding techniques to the corrected timeseries to investigateamplitude and phase modulation. We detected 79 frequencies in the light curveof CoRoT 101128793. They have been identified as the main frequency f0, and itsharmonics, two independent terms, the terms related to the Blazhko frequency,and several combination terms. A Blazhko frequency fB=0.056 c/d and a tripletstructure around the fundamental radial mode and harmonics were detected, aswell as a long-term variability of the Blazhko modulation. Indeed, theamplitude of the main oscillation is decreasing along the CoRoT survey. TheBlazhko modulation is one of the smallest observed in RR Lyrae stars. Moreover,the additional modes f1=3.630 and f2=3.159 c/d are detected. Taking its ratiowith the fundamental radial mode into account, the term f1 could be theidentified as the second radial overtone. Detecting of these modes inhorizontal branch stars is a new result obtained by CoRoT.

CoRoT light curves of RR Lyrae stars. CoRoT 101128793: long-term changes in the Blazhko effect and excitation of additional modes