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http://hdl.handle.net/20.500.12386/26254
Titolo: | Probing O-enrichment in C-rich dust planetary nebulae | Autori: | García-Hernández, D. A. VENTURA, Paolo Delgado-Inglada, G. Dell'Agli, Flavia DI CRISCIENZO, Marcella Yagüe, A. |
Data pubblicazione: | 2016 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 458 | Fascicolo: | 1 | Da pagina:: | L118 | Abstract: | The abundance of O in planetary nebulae (PNe) has been historically used as a metallicity indicator of the interstellar medium (ISM), where they originated; e.g. it has been widely used to study metallicity gradients in our Galaxy and beyond. However, clear observational evidence for O self-enrichment in low-metallicity Galactic PNe with C-rich dust has been recently reported. Here, we report asymptotic giant branch (AGB) nucleosynthesis predictions for the abundances of the CNO elements and helium in the metallicity range Z<SUB>☉</SUB>/4 < Z < 2 Z<SUB>☉</SUB>. Our AGB models, with diffusive overshooting from all the convective borders, predict that O is overproduced in low-Z low-mass (∼1-3 M<SUB>☉</SUB>) AGB stars and nicely reproduce the recent O overabundances observed in C-rich dust PNe. This confirms that O is not always a good proxy of the original ISM metallicity and other chemical elements such as Cl or Ar should be used instead. The production of oxygen by low-mass stars should be thus considered in galactic-evolution models. | URI: | http://hdl.handle.net/20.500.12386/26254 | URL: | https://academic.oup.com/mnrasl/article/458/1/118/2589747 | ISSN: | 0035-8711 | DOI: | 10.1093/mnrasl/slw029 | Bibcode ADS: | 2016MNRAS.458L.118G | Fulltext: | open |
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