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Fig. 4
Evolution of the surface rotation velocity (starting from Ω/Ωc ≈ 0) for CEMP-s star progenitors of different initial masses when adding mass with ja = 5 × 1017 cm2s-1. The colour coding shows that the disappearance of the convective envelope is accompanied by a rapid expansion phase, during which Ω/Ωc increases.
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