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Abundance gradients from Planetary Nebulae in the galactic disk

Published online by Cambridge University Press:  25 May 2016

W.J. Maciel
W.J. Maciel*
Affiliation:
Instituto Astronômico e Geofísico da USP Av. Miguel Stefano 4200, 04301-904 São Paulo SP, Brazil [email protected]

Extract

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Radial abundance gradients in the disks of spiral galaxies are made evident from observations of ionized nebulae (HII regions, planetary nebulae, and SNRs) and stars. They have been observed for several chemical elements, and their presence is an established fact, despite some inconsistencies in the results. Therefore, these gradients can be considered as an additional constraint to the chemical evolution models, as the age-metallicity relation or the metallicity distribution of the G-dwarfs.

Type
VII. Planetary Nebulae in the Galactic Context
Information
Symposium - International Astronomical Union , Volume 180: Planetary Nebulae , 1997 , pp. 397 - 404
Copyright
Copyright © Kluwer 1997 

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