An overabundance of oxygen in planetary nebulae of the solar neighborhood

Details An overabundance of oxygen in planetary nebulae of the solar neighborhood An overabundance of oxygen in planetary nebulae of the solar neighborhood

2011-03-15

arxiv.org/abs/1103.3037v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

2 pages, 1 figure, to appear in "XIII Latin American Regional IAU Meeting" RevMexAAConfSer

Scientific paper

We study the oxygen abundance in five H II regions and seven planetary nebulae (PNe) located within 2 kpc from the Sun that have available spectra of high quality. Our analysis uses a similar procedure and the same atomic data to derive abundances in all the objects. The results calculated with collisionally excited lines for the H II regions indicate that the local interstellar medium is very homogeneous, with 12+log(O/H)=8.45-8.54. As for the PNe, six out of seven show significantly higher abundances: 12+log(O/H)=8.65-8.80. This overabundance of oxygen in PNe also holds when we consider the abundances implied by recombination lines.

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