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Dust formation in oxygen-rich circumstellar shells around long–period variables

Published online by Cambridge University Press:  25 May 2016

Kyung Sook Jeong ,
Jan Martin Winters  and
Erwin Sedlmayr
Kyung Sook Jeong
Affiliation:
Institut für Astronomie und Astrophysik, Technische Universität Berlin, Sekr. PN 8–1, Hardenbergstr. 36, D-10623 Berlin, Germany
Jan Martin Winters
Affiliation:
Institut für Astronomie und Astrophysik, Technische Universität Berlin, Sekr. PN 8–1, Hardenbergstr. 36, D-10623 Berlin, Germany
Erwin Sedlmayr
Affiliation:
Institut für Astronomie und Astrophysik, Technische Universität Berlin, Sekr. PN 8–1, Hardenbergstr. 36, D-10623 Berlin, Germany

Abstract

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We present the first steps of our work aimed at a consistent time-dependent modeling of oxygen–rich circumstellar dust shells (CDS) around pulsating AGB stars. The nature of the most likely nucleation seeds is investigated for this situation and we find that TiO2 is a most promising candidate to serve as the primary condensate, forming already at temperatures well above 1 000 K. These nuclei evolve to macroscopic dust grains by heterogeneous growth processes involving several chemical species. We investigate the varying chemical composition of the resulting dust grains as they evolve as a function of time in a fluid element moving through the CDS of an oxygen–rich long-period variable star (LPV).

Type
Part 3. Formation, Composition, and Processing of Dust
Information
Symposium - International Astronomical Union , Volume 191: Asymptotic Giant Branch Stars , 1999 , pp. 233 - 238
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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