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Hα survey of nearby dwarf galaxies




We present the Hα imaging data and flux measurements for 30 dwarf galaxies in the Local Volume. The Hα fluxes are used to derive the galaxy star-formation rate (SFR). The sample of observed galaxies is characterized by the following parameters: a median distance of 7.5 Mpc, median blue absolute magnitude of −14.8 mag and median SFR of −2.0 dex. Two dSph members of the Local Group, Cetus and Leo IV, do not show signs of star formation, with rates of −5.4 and −7.0 dex, respectively. The BCD galaxy ESO 553−46 has one of the highest specific SFRs among the Local Volume galaxies.