Fig. 7
Stellar wind optical depth according to Eq. (1), for some of our model sequences, shown as a function of time. We show eight stellar models with four different initial masses (60, 100, 300, 500 M⊙), and two initial surface rotational velocities (0, 500 km s-1) in black and red, respectively. The line for unit wind optical depth is plotted to facilitate the comparison.
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