Abstract
The stellar winds of massive stars show large changes in mass-loss rates and terminal velocities during their evolu- tion from O-star through the Luminous Blue Variable phase to the Wolf-Rayet phase. The luminosity remains approximately unchanged during these phases. These large changes in wind properties are explained in the context of the radiation driven wind theory, of which we consider four different models. They are due to the evolutionary changes in radius, gravity and sur- face composition and to the change from optically thin (in continuum) line driven winds to optically thick radiation driven winds.
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