TY  - CHAP
A1  - Votruba, V.
A1  - Feldmeier, Achim
A1  - Kubát, Jiří
A1  - Rätzel, D.
T1  - Multicomponent stellar wind of hot stars
N2  - We developed a time-dependent multicomponent hydrodynamical code for simulation of the stellar wind from hot stars and applied it to stars with high and low density winds.
Y1  - 2007
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-17677
ER  - 
TY  - CHAP
A1  - Feldmeier, Achim
A1  - Hamann, Wolf-Rainer
A1  - Rätzel, D.
A1  - Oskinova, Lida
T1  - Hydrodynamic simulations of clumps
N2  - Clumps in hot star winds can originate from shock compression due to the line driven instability. One-dimensional hydrodynamic simulations reveal a radial wind structure consisting of highly compressed shells separated by voids, and colliding with fast clouds. Two-dimensional simulations are still largely missing, despite first attempts. Clumpiness dramatically affects the radiative transfer and thus all wind diagnostics in the UV, optical, and in X-rays. The microturbulence approximation applied hitherto is currently superseded by a more sophisticated radiative transfer in stochastic media. Besides clumps, i.e. jumps in the density stratification, so-called kinks in the velocity law, i.e. jumps in dv/dr, play an eminent role in hot star winds. Kinks are a new type of radiative-acoustic shock, and propagate at super-Abbottic speed.
Y1  - 2007
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-17975
ER  -