ИСТИНА

The laws of interactions between interstellar medium and stars, also known as stellar feedback, are still on scientific discussion. Dwarf galaxies with solid-state rotation are great for observing and modeling feedback effects. We present deep Hα photometry and panoramic spectroscopy of few dwarf galaxies made by 6-m Russian telescope (BTA) with SCORPIO-2. Star-forming regions are surrounded by expanding HII shells, so-called “bubbles”, blown by stellar wind provided by young blue (OB) stars [1,2]. Their expansion velocity is an independent way to estimate age of star-forming region. We discuss classical methods for determination their expansion velocities and offer a new one. We describe groups of star-forming regions that can be described as star-forming complexes because of their morphology, HI background and surrounding stellar population. Also note that star-forming complexes, located on the rim of kpc-scale HI supergiant shell, have close ages. We provide observational evidence of positive feedback from young stellar population that can trigger star formation in surrounding regions, forming supergiant shells.