Time dependent models of the winds show
lots of structure: turbulence, shock waves, collisions between ÒcloudsÓ
This chaotic behavior is predicted to produce
X-rays through shock-heating of some small fraction of the wind.
The wind structure - and associated shock
heating - is
generated by the line-force instability, which relies on Doppler deshadowing of radiatively-driven
ions to increase
the radiative driving in an exponentially growing feedback process.