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Title:
Chemical abundances in planetary nebulae in three different galaxies
Authors:
Peña, Miriam
Affiliation:
AA(Instituto de Astronomía, Universidad Nacional Autónoma de México)
Publication:
Chemical Abundances in the Universe: Connecting First Stars to Planets, Proceedings of the International Astronomical Union, IAU Symposium, Volume 265, p. 155-158
Publication Date:
03/2010
Origin:
CUP
Keywords:
planetary nebulae: general, galaxies: individual (NGC 3109, NGC 6822, NGC 300), ISM: abundances, etc
DOI:
10.1017/S174392131000044X
Bibliographic Code:
2010IAUS..265..155P

Abstract

We analyze the PNe chemical behavior in three different galaxies, two dwarf irregulars and one spiral. Different behaviors are found. In the very low metallicity galaxy NGC 3109, PNe analyzed appear 0.39 dex O-richer than HII regions, while Ar/H ratio is, in average, 0.15 dex poorer. We interpret this as an evidence of significant O dredge-up in these LIMS, born in a very low metallicity environment. In NGC 6822, with a present metallicity 12+log O/H=8.06, two PN populations were found. A young one, with abundances similar to those in HII regions and an old population, with metallicities a factor of two lower. In this case no strong evidence for O dredge-up in LIMS is found. Therefore, metallicities lower than 12+log O/H =7.7 are required for an efficient O dredge-up. From our preliminary analysis of the abundances of PNe in NGC 300 we find that they are similar to the abundances in HII regions. Apparently, the PNe analyzed belong to a young population. Very similar abundance gradients, with galactocentric distance, are found for HII regions and for PNe.

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