AN OVERABUNDANCE OF OXYGEN IN PLANETARY NEBULAE OF THE SOLAR NEIGHBORHOOD
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 coll...
| Autores: | , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2011 |
| País: | México |
| Recursos: | Instituto Nacional de Astrofísica, Óptica y Electrónica |
| Repositório: | Redalyc-INAOE |
| OAI Identifier: | oai:redalyc.org:57121297090 |
| Acesso em linha: | https://www.redalyc.org/articulo.oa?id=57121297090 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Física, Astronomía y Matemáticas ISM general abundances H II regions planetary nebulae |
| Resumo: | 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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