Circumstellar dust shells around long-period variables. I - Dynamical models of C-stars including dust formation, growth and evaporation

Details Circumstellar dust shells around long-period variables. I - Dynamical models of C-stars including dust formation, growth and evaporation Circumstellar dust shells around long-period variables. I - Dynamical models of C-stars including dust formation, growth and evaporation

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266..321f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 321-339.

Astronomy and Astrophysics

Astrophysics

197

Carbon Stars, Cosmic Dust, Stellar Envelopes, Stellar Models, Variable Stars, Crystal Growth, Dynamic Models, Evaporation, Hydrodynamic Equations, Shock Waves, Stellar Interiors, Stellar Oscillations

Scientific paper

Consistent dynamical models of circumstellar dust shells (CDS) around long-period and Mira variables including formation, growth, and evaporation of amorphous carbon grains are presented. Consideration is given to how the complex interplay among the processes of dust formation and growth, hydrodynamics, and thermodynamics leads to the formation of a discrete radial structure of the CDS, the generation of pronounced shocks due to radiation pressure on dust, and to a significant back-warming effect, i.e., a temperature increase behind a newly formed dust shell caused by the dust opacity. It is shown that shocks that run through the CDS are not caused solely by the pulsation but are the very product of the interaction of the dust complex and the hydrodynamics. It is also shown that the interaction between the dust and the thermodynamics decisively influences where and when new dust is formed.

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