Fig. 2.
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Effective temperature Teff as a function of central helium mass fraction Ycenter during the core helium burning. Panel a: for the 10 M⊙ stars with Z = 0.014 but with different initial rotational velocities, vini = 0 km s−1, 120 km s−1, 250 km s−1, 350 km s−1. Panel b: for the 10 M⊙ stars with Z = 0.0008 but with with the corresponding different initial rotational velocities.
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