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2009MNRAS.399.1126P - Mon. Not. R. Astron. Soc., 399, 1126-1144 (2009/November-1)
Rings and haloes in the mid-infrared: the planetary nebulae NGC 7354 and NGC 3242.
PHILLIPS J.P., RAMOS-LARIOS G., SCHRODER K.-P. and VERBENA CONTRERAS J.L.
Abstract (from CDS):
It is additionally noted that the 3.6 µm/4.5 µm, 5.8 µm/4.5 µm and 8.0 µm/4.5 µm flux ratios increase markedly away from the nuclei, and reach their maximum values in the haloes, where much of the longer wave flux may derive from dust band and continuum emission. An analysis of the rings suggests that some of them, at least, are likely to be associated with higher densities of dust particles, and that the gaseous and particle ring systems are likely to be spatially in register.
Finally, we have analysed the formation of haloes as a result of radiatively accelerated mass loss in the AGB progenitors. Although the models assume that dust formation occurs in C-rich environments, we note that qualitatively similar results would be expected for O-rich progenitors as well. The model fall-offs in halo density are found to result in gradients in halo surface brightness which are similar to those observed in the visible and MIR.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): stars: AGB and post-AGB - ISM: jets and outflows - planetary nebulae: individual: NGC 3242 - planetary nebulae: individual: NGC 7534 - infrared: ISM
Simbad objects: 12
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