Evolution of absolute magnitudes a), B − V and V − K colors b), and number of H , He i, and He ii ionizing photons emitted per second c) throughout the lifetime of a non-rotating 60 M⊙ star. At the top we indicate the duration of evolutionary and spectroscopic phases as reference. To make the post-MS evolution clearer, the ordinate scale was changed at 3.5 Myr.
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