ИСТИНА

Polar-ring galaxies are common among the multi-spin composite systems, the different mechanism of the their formation were proposed: a major dissipative merging, tidal accretion from gas-reach companion or even a cold accretion of pristine low-metallicity gas along a filament. In the last case we could expect the gas chemical abundance of the polar disc much lower in comparison with the main disc of the galaxy. In order to test this hypothesis we performed long-slit observations of the kinematically confirmed sample of polar-ring galaxies from SPRC catalogue at 6-m SAO RAS telescope. We analysed the gas metallicity of the both main and polar discs. Because of weakness of the gas emission lines in the studied sample we applied several widely used empirical calibrations to estimate the gas metallicity and compared the derived values. The results of these study are used to constrain the formation history of polar components in each galaxies.