Fig. 1

Velocity as a function of radius for a set of 15 M⊙ stellar models with different mass-loss rates and boundary conditions. The black continuous lines (from right to left) indicate models with Ṁ equal to 5, 8,10, 20, 30, 50 × 10−6 M⊙ yr−1 and the pink dashed line indicates the model with Ṁ = 4 × 10−6 M⊙ yr−1, all having sonic point boundary conditions. The orange dot-dashed lines indicates the model with Ṁ = 1 × 10−5 M⊙ yr−1 computed with plane parallel grey atmosphere boundary conditions. The green dashed line indicates the local isothermal sound speedfrom the pink dashed model.
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