Planetary nebulae and the chemical evolution of the galactic bulge
Astrophysics
2009-11-13 v1
Abstract
Electron temperatures, densities, ionic and elemental abundances of helium, nitrogen, oxygen, argon, sulfur and neon were derived for a sample of bulge planetary nebulae, representative of its intermediate mass population. Using these results as constraints, a model for the chemical evolution of the galactic bulge was developed. The results indicate that the best fit is achieved using a double-infall model, where the first one is a fast collapse of primordial gas and the second is slower and enriched by material ejected by the bulge itself during the first episode.
Keywords
Cite
@article{arxiv.astro-ph/0508693,
title = {Planetary nebulae and the chemical evolution of the galactic bulge},
author = {Roberto D. D. Costa and Andre V. Escudero and Walter J. Maciel},
journal= {arXiv preprint arXiv:astro-ph/0508693},
year = {2009}
}
Comments
4 pages, 4 figures, to appear in the proceedings of the conference "Planetary Nebulae as astronomical tools" held in Gdansk, Poland, jun 28/jul 02, 2005