Planetary Nebulae as Probes of the Chemical Evolution of Dynamically Hot Systems

Details Planetary Nebulae as Probes of the Chemical Evolution of Dynamically Hot Systems Planetary Nebulae as Probes of the Chemical Evolution of Dynamically Hot Systems

2004-07-16

arxiv.org/abs/astro-ph/0407327v1

Astronomy and Astrophysics

Astrophysics

12 pages, 4 figures, invited talk, Proceedings of the ESO Workshop on Planetary Nebulae beyond the Milky Way, held in Garching

Scientific paper

The measurement of chemical abundances in planetary nebulae in nearby galaxies is now relatively straightforward. The challenge is to use these chemical abundances to infer the chemical evolution of their host galaxies. At this point, our understanding of chemical evolution based upon planetary nebulae in galaxies without star formation is strongly coupled to our understanding of the relationship between the chemical abundances in stars and planetary nebulae in the Milky Way bulge. Supposing that the same relation holds in all systems where star formation ceased long ago, these systems follow a metallicity-luminosity relation that is displaced to higher chemical abundances compared to that found for dwarf irregular galaxies. A more efficient enrichment process appears to be required as part of the explanation for this shift, in addition to the inevitable fading of these galaxies.

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