Formation of Dust Grains in Circumstellar Envelopes of Oxygen-Rich AGB Stars

Details Formation of Dust Grains in Circumstellar Envelopes of Oxygen-Rich AGB Stars Formation of Dust Grains in Circumstellar Envelopes of Oxygen-Rich AGB Stars

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ap%26ss.251..165k&link_type=abstract

Astrophysics and Space Science, Volume 251, Issue 1-2, pp. 165-170

Astronomy and Astrophysics

Astrophysics

27

Scientific paper

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 Ångstroms 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 α-Al2O3 core and a silicate mantle from the radiation transfer calculations based on the results of dust formation calculations.

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