Journal Article

Scaling for the intensity of radiation in spherical and aspherical planetary nebulae

L. Zaninetti

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 395, issue 2, pages 667-691
Published in print May 2009 | ISSN: 0035-8711
Published online April 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14551.x
Scaling for the intensity of radiation in spherical and aspherical planetary nebulae

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Planetary nebulae are imaged using three different physical processes. The first process is the expansion of the shell, which can be modelled by the canonical laws of motion in the spherical case and by momentum conservation when gradients of density are present in the interstellar medium. The second process is the diffusion of particles that radiate from the advancing layer. Three-dimensional diffusion from a sphere and one-dimensional diffusion with drift are analysed. The third process is the composition of an image through an integral operation along the line of sight. The framework developed is applied to A39, the Ring nebula and the etched hourglass nebula MyCn 18.

Keywords: ISM: jets and outflows; ISM: kinematics and dynamics; ISM: lines and bands; planetary nebulae: individual: A39; planetary nebulae: individual: MyCn 18; planetary nebulae: individual: Ring nebula

Journal Article.  7013 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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