Fig. 3

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Major contributions to the radiative acceleration for two hydrodynamically consistent, hydrogen-free WN models with T* = 130 kK, log L/L⊙ = 5.7, M = 20 M⊙, and D∞ = 10 (upper panel) or D∞ = 50 (lower panel): for the line contributions, all elemental contributions except Fe are summed over all ions. The total radiative acceleration (arad), the Thomson acceleration from free electrons (aThom = Γe · g), and the contribution from gas (and turbulence) pressure (apress) are also shown for comparison. The loosely dashed horizontal line denotes the total Eddington limit that needs to be overcome to launch a wind.
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