Abstract
We discuss dust formation in steady state dust driven winds around oxygen-rich AGB stars, including not only homogeneous Al2O3 and silicate grains but also heterogeneous grains consisting of an Al2O3 core and a silicate mantle. In the inner subsonic region, Al2O3 grains with radii of ~ 0.15 μm condense first, then condensation of silicate on Al2O3 starts slightly inside the sonic point, which accelerates the gas flow into the supersonic region. Also small silicate grains, whose radii are a few tens of Angstroms form beyond the sonic point. The carrier of 13 μm feature observed towards oxygen-rich AGB stars is considered to be the core-mantle grains consisting of an a-Al2O3 core and a silicate mantle from the radiation transfer calculations based on the results of dust formation calculations.
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© 1997 Springer Science+Business Media Dordrecht
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Kozasa, T., Sogawa, H. (1997). Formation of Dust Grains in Circumstellar Envelopes of Oxygen-Rich AGB Stars. In: Cherchneff, I., Millar, T.J. (eds) Dust and Molecules in Evolved Stars. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1307-8_20
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DOI: https://doi.org/10.1007/978-94-017-1307-8_20
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-5018-2
Online ISBN: 978-94-017-1307-8
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