The Life Cycle of Dust in the Atmospheres of Pulsating AGB Stars

Details The Life Cycle of Dust in the Atmospheres of Pulsating AGB Stars The Life Cycle of Dust in the Atmospheres of Pulsating AGB Stars

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542701w&link_type=abstract

American Astronomical Society, AAS Meeting #215, #427.01; Bulletin of the American Astronomical Society, Vol. 42, p.342

Physics

Scientific paper

Theoretical studies of mass loss from evolved stars have either emphasized detailed dust nucleation and growth or non-equilibrium physics. Bowen (1988ApJ...329..299B) showed that with non-LTE coupling to the radiation field, slower cooling and reheating, and thus departure from radiative equilibrium during compression and expansion, a refrigerated region forms in the atmospheres of pulsating AGB stars. This provides a region of high supersaturation leading to dust nucleation. Nucleation is sensitive mainly to temperature, but grain growth is limited also by the density of the gas. In this study, we use the Bowen code to investigate how grains first form, grow, sublimate, and perhaps survive to nucleate grains in a subsequent cycle.

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