ИСТИНА

Polar-ring galaxies are classical example of multi-spin composite systems. The different mechanisms of formation of the polar-ring galaxies were proposed: a major dissipative merging, tidal accretion from gas-rich companion, cold accretion of pristine low-metallicity gas along a filament. We performed a long-slit spectroscopy of the kinematically confirmed sample of polar-ring galaxies from SPRC catalogue at the 6-m SAO RAS telescope. Here we focus on our findings about gas chemical abundance in both main and polar components. In most cases our results allowed us to rule out the cold accretion scenario, for which we could expect the gas chemical abundance of the polar disc much lower in comparison with the main galaxy disc.