Abstract
A sample of 122 southern planetary nebulae is analyzed. The sample merges the LNA survey and that by Koppen et al. Average oxygen sulfur, and argon abundances are derived from different age groups of the progenitors. Sulfur and argon have increasing abundances following the metallicity. However, the oxygen abundance seems to be 0.2 dex lower than the solar value of type I planetaries, whose progenitors are not older than 1-2 Gyr. This oxygen deficiency in type I nebulae agrees with abundance determinations in H II regions, intermediate-mass supergiants, and B stars in young associations
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