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We study the oxygen abundance in five H II regions and seven planetarynebulae (PNe) located within 2 kpc from the Sun that have available spectra ofhigh quality. Our analysis uses a similar procedure and the same atomic data toderive abundances in all the objects. The results calculated with collisionallyexcited lines for the H II regions indicate that the local interstellar mediumis very homogeneous, with 12+log(O/H)=8.45-8.54. As for the PNe, six out ofseven show significantly higher abundances: 12+log(O/H)=8.65-8.80. Thisoverabundance of oxygen in PNe also holds when we consider the abundancesimplied by recombination lines.

An overabundance of oxygen in planetary nebulae of the solar neighborhood