Opacity efficiencies of typical dust encountered in circumstellar envelopes of oxygen-rich stars. These opacities are from aluminium oxide Al2O3 (Begemann et al. 1997), iron Fe (Henning & Stognienko 1996), gelhenite Ca2Al2SiO7 (Mutschke et al. 1998), astronomical silicate from (Draine & Lee 1984)(DL84), and forsterite Mg2 SiO4 (Jäger et al. 2003). The N-band between 8 and 14 μm is represented by a grey strip and highlights the silicate vibrational modes.
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