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An overabundance of oxygen in planetary nebulae of the solar neighborhood

By Mónica Rodríguez and Gloria Delgado-Inglada

Abstract

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.Comment: 2 pages, 1 figure, to appear in "XIII Latin American Regional IAU Meeting" RevMexAAConfSe

Topics: Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics
Year: 2011
OAI identifier: oai:arXiv.org:1103.3037
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