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KIC 4247791 is an eclipsing binary observed by the Kepler satellite mission.We wish to determine the nature of its components and in particular the originof a shallow dip in its Kepler light curve that previous investigations havebeen unable to explain in a unique way. We analyze newly obtainedhigh-resolution spectra of the star using synthetic spectra based on atmospheremodels, derive the radial velocities of the stellar components fromcross-correlation with a synthetic template, and calculate the orbitalsolution. We use the JKTEBOP program to model the Kepler light curve of KIC4247791. We find KIC 4247791 to be a SB4 star. The radial velocity variationsof its four components can be explained by two separate eclipsing binaries. Incontradiction to previous photometric findings, we show that the observedcomposite spectrum as well as the derived masses of all four of its componentscorrespond to spectral type F. The observed small dip in the light curve is notcaused by a transit-like phenomenon but by the eclipses of the second binarysystem. We find evidence that KIC 4247791 might belong to the very rarehierarchical SB4 systems with two eclipsing binaries.

KIC 4247791: A SB4 system with two eclipsing binaries (2EBs)