Cross-section of a snapshot of the two models, showing the radial velocity. The black circles represent R = 1.1 R⋆ and R = 1.9 R⋆, the region discussed in Sect. 3.1, and the crosses trace the shockwaves of the models at ∼1.5 R⋆. Top:CO5BOLD model st28gm06n26, with stellar parameters 1M⊙, Teff = 2737 K and L⋆ = 6955 L⊙. The dashed line indicates the x-direction of the model. Gas movements in this direction are later used to illustrate the local dynamics in the 3D models. Bottom: corresponding snap-shot for the DARWIN model l70t27, with stellar parameters 1M⊙, Teff = 2700 K and L⋆ = 7000 L⊙. Beyond ∼1.9 R⋆the DARWIN models show the onset of wind (positive velocities), in contrast to the windless CO5BOLD model.
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