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Multi-site and multi-year differential photometry of the triple star DG Leoreveals a complex frequency spectrum that can be modelled as the combination ofat least three Delta Scuti type frequencies in the range 11.5-13 c/d (withsemi-amplitudes of 2-7 mmag) and a superimposed slow variability of largeramplitude. The period of the slow variation fits very well with half theorbital period of the inner spectroscopic binary indicating the presence ofellipsoidal variations caused by the tidally deformed components in a closeconfiguration. These findings, together with the results of a recentspectroscopic analysis (showing that the system consists of a pair of mild Amstars and one A-type component of normal solar composition), infer that DG Leois an extremely interesting asteroseismic target. Identification of whichcomponent(s) of this multiple system is (or are) pulsating and determination ofthe excited pulsation modes will both contribute to a much better understandingof the non-trivial link between multiplicity, chemical composition, rotation,and pulsation in the lower part of the classical Cepheid instability strip.Comment: 10 pages, 5 Postscript figures, uses rotate.sty. Astronomy and  Astrophysics, in press (2005

A photometric study of the light variations of the triple system DG Leo