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Chemical Abundances of Planetary Nebulae Towards the Galactic Anticenter

Published online by Cambridge University Press:  26 May 2016

Roberto D.D. Costa ,
Walter J. Maciel  and
Monica M.M. Uchida
Roberto D.D. Costa
Affiliation:
IAG/USP - Departamento de Astronomia; Av. Miguel Stéfano 4200, 04301-904 - São Paulo/SP; Brazil
Walter J. Maciel
Affiliation:
IAG/USP - Departamento de Astronomia; Av. Miguel Stéfano 4200, 04301-904 - São Paulo/SP; Brazil
Monica M.M. Uchida
Affiliation:
IAG/USP - Departamento de Astronomia; Av. Miguel Stéfano 4200, 04301-904 - São Paulo/SP; Brazil

Abstract

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We report the results of spectrophotometric determinations of chemical abundances for a planetary nebulae sample located outside the solar circle, with galactocentric distances between 8 and 14 kpc. Our results show a decreasing gradient for R>10 kpc and a possible dependence of the gradient with the age of the progenitors (Work supported by FAPESP).

Type
Part VI: The Ionized Gas in Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 387 - 388
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

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Costa, R.D.D., Chiappini, C., Maciel, W.J., de Freitas Pacheco, J.A. 1997 in Advances in Stellar Evolution, ed. Rood, R.T. & Renzini, A. (Cambridge: CUP), 159 Google Scholar
Maciel, W.J., & Köppen, J. 1994, A&A 282, 436 Google Scholar