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Chemical evolution models for NGC 6822 using planetary nebulae abundances

Published online by Cambridge University Press:  30 August 2012

Liliana Hernández-Martínez ,
Leticia Carigi ,
Miriam Peña  and
Manuel Peimbert
Liliana Hernández-Martínez
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70264, Méx. D. F., 04510México. (carigi@astro.unam.mx, miriam@astro.unam.mx, peimbert@astro.unam.mx). Instituto Nacional de Astrofísica, Optica y Electrónica, Luis Enrique Erro No. 1, Puebla, México. (lilihe@inaoep.mx).
Leticia Carigi
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70264, Méx. D. F., 04510México. (carigi@astro.unam.mx, miriam@astro.unam.mx, peimbert@astro.unam.mx).
Miriam Peña
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70264, Méx. D. F., 04510México. (carigi@astro.unam.mx, miriam@astro.unam.mx, peimbert@astro.unam.mx).
Manuel Peimbert
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70264, Méx. D. F., 04510México. (carigi@astro.unam.mx, miriam@astro.unam.mx, peimbert@astro.unam.mx).
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Abstract

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We present chemical evolution models for the dwarf irregular NGC 6822, using chemical abundances of Planetary Nebulae (PNe) and HII regions and also the mass of gas (Mgas) as observational constraints. Chemical evolution models have been calculated to reproduce the abundances as derived from both, collisionally excited lines (CELs) and recombination lines (RLs). In our models, the chemical contribution of low and intermediate mass stars (LIMS) is time delayed, while for the massive stars the chemical contribution is instantaneous, as in Franco & Carigi (2008). The chemical contribution of SNIa is included in our model, thus we are also able to reproduce the observational Fe/H abundance obtained from A stars.

Keywords

Galaxies: abundancesgalaxies: evolutiongalaxies: individual (NGC 6822)HII regionsplanetary nebulae: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 386 - 387
Copyright
Copyright © International Astronomical Union 2012

References

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Hernández-Martínez, L., Peña, M., Carigi, L., & García-Rojas, J., 2009, A&A, 505, 1027 Google Scholar
Hernández-Martínez, L., Carigi, L., Peña, M., & Peimbert, M., 2011, A&A, (in press)Google Scholar
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