Dust formation in winds of long-period variables. IV. Atmospheric dynamics and mass loss.

Details Dust formation in winds of long-period variables. IV. Atmospheric dynamics and mass loss. Dust formation in winds of long-period variables. IV. Atmospheric dynamics and mass loss.

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...319..648h&link_type=abstract

Astronomy and Astrophysics, v.319, p.648-654

Astronomy and Astrophysics

Astrophysics

112

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

Scientific paper

We have calculated radiation-hydrodynamical models of the atmosphere and circumstellar dust shell of C-rich long-period variables which include a detailed description of the dust formation process. We discuss the time-dependent behaviour of the circumstellar envelope (e.g. multiperiodicity) and its relevance for observational properties like near-IR light curves and investigate the time-averaged mass loss characteristics of a sample of models satisfying radius-luminosity-mass and period-luminosity relations. The results can be summarized as follows: The dependence of the mass loss rate on stellar parameters predicts a strong increase of mass loss as stars evolve along the AGB. The models presented agree reasonably well with mean mass loss-period relations deduced from observations of Mira stars and the observed scatter of mass loss rates for a given period can be understood in terms of pulsation amplitude or non-linearities of the wind mechanism. The wind velocities show a good correlation with the quantity (ρ_d_/ρ_g_) L_*_/M_*_ which characterizes the strength of radiation pressure on dust relative to gravitation.

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