2010
DOI: 10.1111/j.1365-2966.2010.17259.x
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Why is the librational water-ice band at 11.5 μm so difficult to detect?

Abstract: Radiative transfer models have been produced for stars surrounded by circumstellar dust shells in order to investigate the detectability of the 11.5-µm librational band due to water-ice (H 2 Oice). The dust grains were assumed to be composed of a core material of either amorphous silicate of olivine composition (MgFeSiO 4 ) or alumina (Al 2 O 3 ), both grain species being coated with a water-ice mantle. The models may be divided into three classes: those with small, intermediate and large optical depths. It is… Show more

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Cited by 8 publications
(22 citation statements)
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“…e.g. Koike et al 1995;Begemann et al 1997;Posch et al 1999;Egan & Sloan 2001;Woitke et al 2006;Ireland & Scholz 2006;and Robinson & Maldoni 2010), and it can survive at high temperatures.…”
Section: Discussion and Interpretationmentioning
confidence: 99%
“…e.g. Koike et al 1995;Begemann et al 1997;Posch et al 1999;Egan & Sloan 2001;Woitke et al 2006;Ireland & Scholz 2006;and Robinson & Maldoni 2010), and it can survive at high temperatures.…”
Section: Discussion and Interpretationmentioning
confidence: 99%
“…Posch et al 1999;Fabian et al 2001). In particular, amorphous Al 2 O 3 provides significant opacity for wavelengths longwards of 10 μm (Koike et al 1995;Begemann et al 1997;Posch et al 1999;Woitke 2006a;Ireland & Scholz 2006;Robinson & Maldoni 2010). In addition, features of crystalline aluminum oxide (corundum, α-Al 2 O 3 ) at 12.7 μm and several modifications of titanium oxide (e.g.…”
Section: Spectral Features and Detectabilitymentioning
confidence: 99%
“…In this study we have primarily used the laboratory‐determined optical constants (the real and imaginary parts of the complex refractive index) for amorphous olivine (MgFeSiO 4 ) from Dorschner et al (1995), as available from the dusty (Ivezić & Elitzur 1995, 1997) optical constants library 1 . These optical constants were used by Robinson & Maldoni (2010) in their study of the water‐ice librational band and by Maldoni, Ireland & Robinson (2008) to represent the spectrum of the post‐AGB star IRAS 22036+5306. Hereafter, unless otherwise stated, the term ‘silicate’ means these specific laboratory silicates, as opposed to ‘astronomical silicates’, which will also be employed in the modelling of AFGL 961E in .…”
Section: The Opacity Data and Grain Propertiesmentioning
confidence: 99%
“…For this study we have used a radiative transfer model based on the quasi‐diffusion method of Leung (Leung 1975, 1976; Egan, Leung & Spagna 1988) as implemented by Mitchell & Robinson (1978, 1980). The most recent discussion of this implementation is presented by Robinson & Maldoni (2010). Briefly the model calculates the output spectrum from a star surrounded by a spherically symmetric dust shell, without significant approximation, for an arbitrary opacity law, an arbitrary density distribution and an arbitrary mixture of grain species, and includes the effects of (linearly) anisotropic scattering.…”
Section: The Radiative Transfer Modelmentioning
confidence: 99%
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