Scaling for the intensity of radiation in spherical and aspherical planetary nebulae |
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Authors: | L Zaninetti |
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Institution: | Dipartimento di Fisica Generale, Via Pietro Giuria 1, 10125 Torino, Italy |
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Abstract: | 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. |
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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 |
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