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Helium abundances in planetary nebulae: Nucleosynthesis and chemical evolution

Published online by Cambridge University Press:  23 April 2010

W. J. Maciel ,
R. D. D. Costa  and
T. E. P. Idiart
W. J. Maciel
Affiliation:
University of São Paulo, Astronomy Department, Rua do Matão 1226, Cidade Universitária, São Paulo SP, CEP 05509-0900, Brazil email: maciel@astro.iag.usp.br, roberto@astro.iag.usp.br, thais@astro.iag.usp.br
R. D. D. Costa
Affiliation:
University of São Paulo, Astronomy Department, Rua do Matão 1226, Cidade Universitária, São Paulo SP, CEP 05509-0900, Brazil email: maciel@astro.iag.usp.br, roberto@astro.iag.usp.br, thais@astro.iag.usp.br
T. E. P. Idiart
Affiliation:
University of São Paulo, Astronomy Department, Rua do Matão 1226, Cidade Universitária, São Paulo SP, CEP 05509-0900, Brazil email: maciel@astro.iag.usp.br, roberto@astro.iag.usp.br, thais@astro.iag.usp.br
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Abstract

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We have obtained a large sample of PN with accurately determined helium abundances, as well as abundances of several heavy elements. The nebulae are located in the solar neighbourhood, in the galactic bulge, disk and anticentre, and in the Magellanic Clouds. The abundances are analyzed both in terms of the nucleosynthesis of intermediate mass stars and the chemical evolution of the host galaxies. In particular, correlations between the He/H ratio and the abundances of N and O are used as constraints of the nucleosynthetic processes occurring in the progenitor stars.

Keywords

ISM: planetary nebulae: generalGalaxy: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 181 - 182
Copyright
Copyright © International Astronomical Union 2010

References

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Marigo, P., Bernard-Salas, J., Pottasch, S. R., et al. , 2003, A&A, 409, 619Google Scholar
Stasińska, G., Richer, M. G., & McCall, M. 1998, A&A, 336, 667Google Scholar