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The results of optical spectroscopy of H II regions in a sample of southerndwarf irregulars consisting of five dwarf galaxies in the Centaurus A group,four dwarfs in the Sculptor group, and eight additional dwarf galaxies arepresented. Oxygen abundances are derived using the direct method where [OIII]4363 is detected; otherwise, abundances are derived with the bright-linemethod using the McGaugh and the Pilyugin calibrations. ESO358-G060 has thelowest oxygen abundance (12+log(O/H) = 7.32), which is comparable to the valuefor the second most metal-poor galaxy known (SBS0335-052). In all, new oxygenabundances are reported for nine dwarf galaxies; updated values are presentedfor the remaining galaxies. Derived oxygen abundances are in the range from 3%to 26% of the solar value. Oxygen abundances for dwarfs in the southern sampleare consistent with the metallicity-luminosity relationship defined by acontrol sample of dwarf irregulars with [O III]4363 abundances andwell-measured distances. However, NGC5264 appears to have an (upper branch)oxygen abundance approximately two to three times higher than other dwarfs atsimilar luminosities. Nitrogen-to-oxygen and neon-to-oxygen abundance ratiosare also reported; in particular, IC1613 and IC5152 show elevatednitrogen-to-oxygen ratios for their oxygen abundances.Comment: Accepted, A&A; 22 pages incl. 7 eps figures (A&A v5.2 LaTeX2e

Nebular abundances of nearby southern dwarf galaxies