Hα survey of nearby dwarf galaxies


E-mail: skai@sao.ru


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.