Diffuse ionized gas and chemical abundances in IC 1727

Long-slit spectroscopy results of the dwarf spiral galaxy IC 1727, which is interacting with NGC 672, are presented. The extinction, excitation, density and shocks throughout the galaxy are studied, as well as the oxygen abundances of a total of 22 H ii regions. The interstellar medium of this galaxy is very perturbed, with high values of the [S ii]/Hα ratio and high excitation values throughout the galaxy (inside the H ii regions and in the diffuse ionized gas). Such values might be an indication of strong perturbations resulting from the interaction between IC 1727 and NGC 672. Shocks are the second source of ionization of the diffuse ionized gas, after leaking photons from H ii regions. The chemical abundance of this galaxy is well below solar and closer to the values of the Large Magellanic Cloud. The abundances differ between the various H ii regions of the galaxy, as observed in other spiral galaxies.