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He I temperatures in planetary nebulae

Published online by Cambridge University Press:  30 August 2012

Antonio Peimbert
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado postal 70-264, MéxicoD. F. 4510, México email: [email protected]; [email protected]
Manuel Peimbert
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado postal 70-264, MéxicoD. F. 4510, México email: [email protected]; [email protected]
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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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2012

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