Journal Article

Radiation transfer in the cavity and shell of a planetary nebula

M. D. Gray, M. Matsuura and A. A. Zijlstra

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 422, issue 2, pages 955-967
Published in print May 2012 | ISSN: 0035-8711
Published online April 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20585.x
Radiation transfer in the cavity and shell of a planetary nebula

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We develop an approximate analytical solution for the transfer of line-averaged radiation in the hydrogen recombination lines for the ionized cavity and molecular shell of a spherically symmetric planetary nebula. The scattering problem is treated as a perturbation, using a mean intensity derived from a scattering-free solution. The analytical function was fitted to Hα and Hβ data from the planetary nebula NGC 6537. The position of the maximum in the intensity profile produced consistent values for the radius of the cavity as a fraction of the radius of the dusty nebula: 0.21 for Hα and 0.20 for Hβ. Recovered optical depths were broadly consistent with observed optical extinction in the nebula, but the range of fit parameters in this case is evidence for a clumpy distribution of dust.

Keywords: radiative transfer; stars: AGB and post-AGB; stars: atmospheres; circumstellar matter; stars: mass-loss; dust, extinction

Journal Article.  9104 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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