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• W2053649421 abstract "We present the spectral energy distribution (SED) of the preplanetary nebula, IRAS 19475+3119 (hereafter I 19475), from the optical to the far-infrared. We identify emission features due to crystalline silicates in the ISO SWS spectra of the star. We have fitted the SED of I 19475 using a one-dimensional radiative transfer code and find that a shell with inner and outer radii of 8.8 × 1016 and 4.4 × 1017 cm and dust temperatures ranging from about 94 to 46 K provides the best fit. The mass of this shell is ≳1[34 cm2 g-1/κ(100 μm)] (δ/200) M☉, where κ(100 μm) is the 100 μm dust mass absorption coefficient (per unit dust mass) and δ is the gas-to-dust ratio. In agreement with results from optical imaging and millimeter-wave observations of CO emission of I 19475, our model fits support an r-3 density law for its dust shell, with important implications for the interaction process between the fast collimated post-AGB winds and the dense AGB envelopes that results in the observed shapes of PPNs and PNs. We find that the observed JCMT flux at submillimeter wavelengths (850 μm) is a factor ~2 larger than our model flux, suggesting the presence of large dust grains in the dust shell of I 19475 that are not accounted for by our adopted standard MRN grain size distribution." @default.
• W2053649421 created "2016-06-24" @default.
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• W2053649421 date "2006-06-20" @default.
• W2053649421 modified "2023-10-03" @default.
• W2053649421 title "The Dust Envelope of the Preplanetary Nebula IRAS 19475+3119" @default.
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• W2053649421 doi "https://doi.org/10.1086/503864" @default.
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