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astro-ph2004
A comparison of the time variation of radial abundance gradients from planetary nebulae and open clusters
W. J. Maciel, R. D. D. Costa, P. A. L. Ferreira
The temporal behaviour of the radial abundance gradients has important consequences on models for the chemical evolution of the Galaxy. We present a comparison of the time variatio…
astro-ph2001
PN and galactic chemical evolution
W. J. Maciel, R. D. D. Costa
Recent applications of PN to the study of galactic chemical evolution are reviewed, such as PN and stellar populations, abundance gradients, including their space and time variatio…