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Paper: AKARI/IRC Observations of Heavily Obscured Oxygen-Rich AGB and Post-AGB Stars
Volume: 418, AKARI, a Light to Illuminate the Misty Universe
Page: 431
Authors: Bunzel, F.; García-Hernández, D. A.; Engels, D.; Perea-Calderón, J. V.; García-Lario, P.
Abstract: We present AKARI/IRC observations of a sample of six extremely red IRAS sources, of which three are variable OH/IR stars and the rest are early post-AGB stars. The OH/IR stars show a red continuum with the expected strong 10 μm silicate absorption feature, while the post-AGB stars show an even redder continuum accompanied with a comparably weak silicate absorption. We modelled the spectral energy distributions with DUSTY. While for the OH/IR stars a reasonable fit can be obtained with almost pure silicate dust, the post-AGB stars require a mixture of silicate and carbon-rich dust. We assume that in the latter objects the inner dust shell is carbon-rich, while the outer shells are still oxygen-rich.
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