Dust formation in winds of long-period variables. III. Dynamical models and confirmation of a dust-induced κ-mechanism.

Details Dust formation in winds of long-period variables. III. Dynamical models and confirmation of a dust-induced κ-mechanism. Dust formation in winds of long-period variables. III. Dynamical models and confirmation of a dust-induced κ-mechanism.

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...297..815h&link_type=abstract

Astronomy and Astrophysics, v.297, p.815

Astronomy and Astrophysics

Astrophysics

82

Hydrodynamics, Instabilities, Stars: Carbon, Stars: Circumstellar Matter, Stars: Mass-Loss, Stars: Agb And Post-Agb

Scientific paper

We present self-consistent dynamical models for purely dust driven winds of C-rich AGB stars which are based on the coupled system of radiation hydrodynamics and time-dependent dust formation and growth. Investigating the dependence of the solution on the relative abundance of carbon to oxygen (i.e. the amount of condensable material) for several sets of stellar parameters we obtain stationary dust driven winds as well as solutions with periodic dust formation and creation of shock waves without applying a variable inner boundary to simulate a pulsation of the underlying star. Model series with certain stellar parameters show a transition from stationary winds to time-dependent solutions with discrete dust layers and shock waves as the carbon/oxygen abundance ratio exceeds a critical value. Summarizing the results, our calculations demonstrate that the limit case of stationary dust driven winds can be reproduced using the full, time-dependent code and furthermore provide an independent confirmation of the dust-induced κ-mechanism proposed by Fleischer et al. (1994).

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