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Title: Interferometric Detection of Amorphous Alumina Grains in Betelgeuse
Authors: Verhoelst, Tijl
Decin, Leen
Hony, S
Cami, J
Eriksson, K
Perrin, G
Deroo, P
Vandenbussche, Bart
Waters, L.B.F.M #
Issue Date: 2006
Host Document: Instrumentation, Mesure, Métrologie vol:6/1-4 pages:361-364
Conference: Visions for Infrared Astronomy location:Paris, France date:March 20-22, 2006
Abstract: We present a study of the extended atmosphere of the late-type supergiant Betelgeuse. From near-IR observations, we find that Betelgeuse has only a very low density water layer just above the photosphere. However, mid-IR observations suggest a much larger opacity source close to the photosphere, which can not be due to the water layer. We show that amorphous alumina grains are the most likely source of this opacity and discuss this hypothesis in the context of dust-condensation scenarios.
Publication status: published
KU Leuven publication type: IC
Appears in Collections:Institute of Astronomy
# (joint) last author

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