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Date and Time of the Query: 2019-05-24 T06:20:03 PDT
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For refcode 2001A&A...374..412P:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2001A&A...374..412P Oxygen abundances in dwarf irregular galaxies and the metallicity-luminosity relationship L. S. Pilyugin Main Astronomical Observatory of National Academy of Sciences of Ukraine, Goloseevo, 03680 Kiev-127, Ukraine Received 20 December 2000/Accepted 2 May 2001 Abstract. 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. Key words: galaxies: abundances - galaxies: ISM - galaxies: irregular - galaxies: individual: NGC 6822
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