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CLOUDY modeling of weird Far-IR emission in the central zone of the Helix Nebula

Published online by Cambridge University Press:  15 December 2006

Adrienne Dove  and
Angela Speck
Adrienne Dove
Affiliation:
Department of Physics & Astronomy, University of Missouri, Columbia, MO 65201, USA email: ard3k5@mizzou.edu
Angela Speck
Affiliation:
Department of Physics & Astronomy, University of Missouri, Columbia, MO 65201, USA email: ard3k5@mizzou.edu
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Abstract

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We present the results of CLOUDY modeling of the central zone of the Helix Nebula. Our aim was to match the observed, excess far-infrared emission. Our best fit models fill the central zone with 1$\mu$m-sized grains, with a gas-to-dust ratio of 500, where precise composition is unimportant. We speculate on the origin of these grains.

Keywords

(ISM:) planetary nebulae: individual (NGC 7293)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S234: Planetary Nebulae in our Galaxy and Beyond , April 2006 , pp. 389 - 390
Copyright
© 2006 International Astronomical Union