ИСТИНА

Dwarf irregular (dIrr) galaxies provide the best environment for studying the influence of supernovae and stellar winds onto the ISM leading to creation of the superbubbles and large HI supershells. Thanks to thick solid-body rotating discs, such structures grow to a large sizes (up to several kpc) and live longer than in spiral galaxies. The interaction of the HI supershells might trigger a new burst of star formation in a galaxy, while the influence of ongoing star formation in their rims might lead to dissolution of the HI structures. Here we present the results of long-term observations of several nearby dIrr galaxies made with a scanning Fabry-Perot interferometer and narrow-band filters performed at the 6-m telescope of SAO RAS. An analysis of the ionized gas morphology and kinematics in star forming regions of these galaxies allowed us to identify a number of expanding superbubbles, as well as a lot of filament-like ionized structures. We show that star formation in the observed galaxies mainly take place in the unified complexes with sizes of several hundreds pc inside the rims of giant HI supershells. A certain signs of star formation propagation within these complexes, as well as its triggering at the scales of the whole complexes, are detected. In this poster we focus on the results obtained for the Holmberg I, Holmberg II, IC 2574 and NGC 4068 galaxies.