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He I temperatures in planetary nebulae

Published online by Cambridge University Press:  30 August 2012

Antonio Peimbert  and
Manuel Peimbert
Antonio Peimbert
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado postal 70-264, MéxicoD. F. 4510, México email: antonio@astroscu.unam.mx; peimbert@astroscu.unam.mx
Manuel Peimbert
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado postal 70-264, MéxicoD. F. 4510, México email: antonio@astroscu.unam.mx; peimbert@astroscu.unam.mx
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Abstract

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It is well established that PNe are not thermally homogeneous, beyond what chemically homogeneous photoionization models predict. To discriminate between the different scenarios proposed in the literature, we have determined the temperature based on He I lines for a dozen PNe. We compare these determinations with those derived from the Balmer continua. We find that the He I temperatures agree with the Balmer temperatures and that both are lower than those derived from CELs; suggesting that most PNe are chemically homogeneous.

Keywords

planetary nebulae: generalISM: abundancesstars: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 466 - 467
Copyright
Copyright © International Astronomical Union 2012

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