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Published online by Cambridge University Press: 02 December 2009
We discuss recent results based on our ongoing work on the study of the chemical abundances in the central part of spiral galaxies. A robust technique has been used to extrapolate the derived radial abundance gradients of oxygen to the center of the respective galaxies, taking into account the recent ff relation of Pilyugin (2005) and the new model-independent correction for electron-temperature structure within the H II regions as well as the contribution of a possible oxygen depletion by dust grains. In this way, a typical value for the expected maximum O/H abundance in spiral galaxies is derived. Implications of this result for the metallicity–luminosity relation and for the chemical abundances derived for high-redshift-galaxy samples are briefly discussed.
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