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The presence of g- and p-modes allows testing stellar models from the core tothe envelope. Moreover, binarity in an eclipsing system constrains the physicalparameters of the pulsating star. CoRot ID 100866999 is a relativelylarge-amplitude hybrid gDor - dSct star with two clearly distinct frequencydomains. The large number of detected frequencies allows a detailed study ofthe interaction between them. In addition, we can derive the fundamentalparameters of both components from the study of the eclipsing light curve.After removing the eclipsing phases, we analyzed the data with the Period04package up to S/N=4. The light curve was then prewhitened with theseoscillation frequencies to derive the fundamental parameters of the twocomponents. The eclipsing light curve analysis results in a (1.8+1.1)\,Mosystem, both components being main sequence stars. We detect 124 frequenciesrelated to luminosity variations of the primary. They are present in twowell-separated domains: 89 frequencies in the interval [0.30;3.64]/d and 35 inthe interval [14.57; 33.96]/d. There are 22 gDor frequencies separated by aconstant period interval Delta P = 0.03493 d. These frequencies correspond to aseries of g-modes of degree ell=1 with successive radial orders k. We identify21 linear combinations between the first nine gDor frequencies. The dSct domainis dominated by a large-amplitude frequency F=16.9803 /d. The eight first gDorfrequencies f_i are present with much lower amplitude in the delta Scuti domainas F +/- f_i. These interactions between g- and p-modes confirm the phenomenonwe detected in another CoRoT star. The amplitude and the phase of the mainfrequency F shows a double-wave modulation along the orbital phase, giving riseto series of combination frequencies. Such combination frequencies are alsodetected, with lower amplitude, for the first gDor modes.

The CoRoT star ID100866999: a hybrid gamma Doradus - delta Scuti star in an eclipsing binary system