Hertzsprung–Russell diagram of three low-Z evolutionary models that become core-hydrogen-burning SG stars with initial masses of 150, 257, and 575 M⊙ and initial rotational velocity of 100 km s−1. Dots in the tracks mark every 105 years of evolution. Crosses mark the end of the core-hydrogen-burning phase; in case of the model with 575 M⊙, the end of the computation. Theoretical mass-loss rates are colour coded, and dashed lines indicate the radial size of the stars on the diagram.
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