Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-09-09
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
19 pages, 12 figures, Accepted for publication in MNRAS. 56 pages in arXiv
Scientific paper
10.1111/j.1365-2966.2009.15379.x
We present images of the planetary nebulae (PNe) NGC 7354 and NGC 3242 in four mid-infrared (MIR) photometric bands centred at 3.6, 4.5, 5.8 and 8.0 microns; the results of observations undertaken using the Spitzer Space Telescope (SST). The resulting images show the presence of a halo and rings in NGC 3242, as previously observed through narrow band imaging at visual wavelengths, as well as evidence for a comparable halo and ring system in NGC 7354. This is the first time that a halo and rings have been observed in the latter source. We have analysed the formation of halos 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.
Phillips J. P.
Ramos-Larios Gerardo
Schroeder Klaus-Peter
Verbena Contreras J. L.
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