Nebular Abundances of Nearby Southern Dwarf Galaxies

2); Canada; (3) University of Washington; Eva K. Grebel (1); Germany; (2) York University; Heidelberg; Henry Lee (1; Paul Hodge (3) ((1) Max-Planck-Institute for Astronomy; Seattle; Toronto; USA)

Nebular Abundances of Nearby Southern Dwarf Galaxies

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arxiv astro-ph/0301492 v1 pith:UMZ4A4HM submitted 2003-01-24 astro-ph

Henry Lee (1 , 2) , Eva K. Grebel (1) , Paul Hodge (3) ((1) Max-Planck-Institute for Astronomy , Heidelberg , Germany; (2) York University , Toronto , Canada; (3) University of Washington

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keywords abundancesoxygendwarfgalaxiesabundancederiveddwarfssample

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The results of optical spectroscopy of H II regions in a sample of southern dwarf irregulars consisting of five dwarf galaxies in the Centaurus A group, four dwarfs in the Sculptor group, and eight additional dwarf galaxies are presented. Oxygen abundances are derived using the direct method where [O III]4363 is detected; otherwise, abundances are derived with the bright-line method using the McGaugh and the Pilyugin calibrations. ESO358-G060 has the lowest oxygen abundance (12+log(O/H) = 7.32), which is comparable to the value for the second most metal-poor galaxy known (SBS0335-052). In all, new oxygen abundances are reported for nine dwarf galaxies; updated values are presented for 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 sample are consistent with the metallicity-luminosity relationship defined by a control sample of dwarf irregulars with [O III]4363 abundances and well-measured distances. However, NGC5264 appears to have an (upper branch) oxygen abundance approximately two to three times higher than other dwarfs at similar luminosities. Nitrogen-to-oxygen and neon-to-oxygen abundance ratios are also reported; in particular, IC1613 and IC5152 show elevated nitrogen-to-oxygen ratios for their oxygen abundances.

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