Journal
ASTRONOMY & ASTROPHYSICS
Volume 374, Issue 2, Pages 412-420Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20010732
Keywords
galaxies : abundances; galaxies : ISM; galaxies : irregular; galaxies : individual : NGC 6822
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The low-luminosity dwarf irregular galaxies are considered. The oxygen abundances in H II regions of dwarf irregular galaxies were recalculated from published spectra through the recently suggested P-method. It has been found that the metallicity of low-luminosity dwarf irregular galaxies, with a few exceptions, correlates well with galaxy luminosity. The dispersion of oxygen abundances around the metallicity-luminosity relationship increases with decreasing galaxy luminosity, as was found by Richer & McCall (1995). The absence of a relationship between the oxygen abundance and the absolute magnitude in the blue band for irregular galaxies obtained by Hidalgo-Gamez & Olofsson (1998) can be explained by the large uncertainties in the oxygen abundances derived through the T-e-method, that in turn can be explained by the large uncertainties in the measurements of the strengths of the weak oxygen line [OIII]lambda 4363 used in the T-e-method.
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