Clumping in hydrodynamic atmosphere models

Details Clumping in hydrodynamic atmosphere models Clumping in hydrodynamic atmosphere models

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008cihw.conf..103g&link_type=abstract

Clumping in hot-star winds : proceedings of an international workshop held in Potsdam, Germany, 18. - 22. June 2007. Hamann, Wol

Physics

Scientific paper

We investigate the effect of wind clumping on the dynamics of Wolf-Rayet winds, by means of the Potsdam Wolf-Rayet (PoWR) hydrodynamic atmosphere models. In the limit of microclumping the radiative acceleration is generally enhanced. We examine the reasons for this effect and show that the resulting wind structure depends critically on the assumed radial dependence of the clumping factor D(r). The observed terminal wind velocities for WR stars imply that D(r) increases to very large values in the outer part of the wind, in agreement with the assumption of detached expanding shells.

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