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2010MNRAS.408.1956R - Mon. Not. R. Astron. Soc., 408, 1956-1967 (2010/November-1)
Why is the librational water-ice band at 11.5µm so difficult to detect ?
ROBINSON G. and MALDONI M.M.
Abstract (from CDS):
For the librational band to display its characteristic shape requires far larger amounts of water-ice than are present in any known circumstellar dust shell, as indicated by the depth of the much stronger 3.1-µm water-ice band. The best prospect for finding some evidence of the librational band is likely to be via using a small beam centred on the cooler outer regions of the dust shell; in this case the line of sight may encounter only water-ice coated grains, thereby reducing the contaminating effect of bare grains. If a grain species such as alumina is present, with a broad absorption band in the vicinity of 11.5µm, the identification of the librational band may be possible, perhaps surprisingly, as result of the sharpening of the 11.5-µm feature. We have fitted the spectrum of IRAS 22036+5306 and find that, although water-ice is clearly present in this object, as evidenced by the presence of the strong 3.1-µm band, the librational band has no obvious effect on its 10-µm spectrum.
Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS
Journal keyword(s): radiative transfer - circumstellar matter - dust, extinction - infrared: stars - stars: AGB and post-AGB
Simbad objects: 9
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