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2026RNAAS..10....8L - Research Notes of the AAS, 10, 8 (2026/January-0)
Modeling of Circumstellar Alumina and Silicate Dust around Evolved Stars.
LAYWELL S.R., SARGENT B.A. and SPECK A.K.
Abstract (from CDS):
Spectra of some asymptotic giant branch (AGB) and red supergiant (RSG) stars show emission features at mid-infrared wavelengths, such as at 13 μm, that have previously been inconclusively identified. We present models of dust emission seen in spectra of 3 oxygen-rich (O-rich) AGB stars and 1 RSG star. The models utilize the opacities of grains of amorphous silicates, amorphous alumina, corundum, and other polymorphs of alumina to fit the dust spectra. Corundum fits the 13 μm feature, and other polymorphs of alumina plus amorphous alumina are required to fit the other characteristics of the spectra.
Abstract Copyright: © 2026. The Author(s). Published by the American Astronomical Society.
Journal keyword(s): Circumstellar dust - Evolved stars - Asymptotic giant branch stars
Simbad objects: 4
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