POSTER PAPER 9.02
An Improved Mass-loss Description for Dust-driven Superwinds
Astrid Wachter, Klaus-Peter Schroeder, Jan Martin Winters
Institute: Astronomy Centre, University of Sussex, Brighton
Institute: Zentrum fuer Astronomie und Astrophysik, Technische Universitat, Berlin
Institute: Max-Planck-Institut fuer Radioastronomie, Bonn
Contact Email: A.C.Wachter@sussex.ac.uk
Abstract:
We consider the mass loss of stars during the final stages of their
evolution. Our mass loss description for the tip-AGB is based on
pulsating wind models in which the mass loss is driven by radiation
pressure on dust grains, for a C-rich chemistry. From a grid of
these models an improved approximative mass-loss rate formula has
been derived which depends on the stellar parameters: effective
temperature, luminosity, and mass only. The dependence of the
mass-loss rate on the pulsation period has been taken into account
by applying the observed period-luminosity relation for C-rich
Miras. Since the wind models treat in detail the chemistry and
micro-physics of the dust formation process, the resulting mass-loss
rate depends strongly on the stellar effective temperature,
reflecting the sensitivity of the dust formation process on the
local thermodynamic conditions.
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Manuscript submitted: 2001-Sep-03
"The Future of Cool-Star Astrophysics", 2003, Eds. A. Brown,
G. M. Harper, & T. R. Ayres.
Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems,
& The Sun,
© 2003 University of Colorado.