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We present N-body/SPH simulations of the evolution of an isolated dwarfgalaxy including a detailed model for the ISM, star formation and stellarfeedback. Depending on the strength of the feedback, the modelled dwarf galaxyshows periodic or quasi-periodic bursts of star formation of moderate strength.The period of the variations is related to the dynamical timescale, of theorder of $1.5~10^8$ yr. We show that the results of these simulations are ingood agreement with recent detailed observations of dwarf irregulars (dIrr) andthat the peculiar kinematic and morphological properties of these objects,asrevealed by high resolution HI studies, are fully reproduced. We discuss theseresults in the context of recent surveys of dwarf galaxies and point out thatif the star formation pattern of our model galaxy is typical for dwarfirregulars this could explain the scatter of observed properties of dwarfgalaxies. Specifically, we show that the time sampled distribution of the ratiobetween the instanteneous star formation rate (SFR) and the mean SFR is similarto that distribution in observed sample of dwarf galaxies.Comment: 11 pages, 6 figures, accepted for A&

Periodic bursts of star formation in irregular galaxies