Radiation Transfer in the Cavity and Shell of Planetary Nebulae

Details Radiation Transfer in the Cavity and Shell of Planetary Nebulae Radiation Transfer in the Cavity and Shell of Planetary Nebulae

2012-01-18

arxiv.org/abs/1201.3930v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

MNRAS accepted; 10 Figs

Scientific paper

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 Halpha and Hbeta data from the planetary nebula NGC6537. 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 Halpha and 0.20 for Hbeta. 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.

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