Evidence for a Large Main Sequence Widening: A Plea for Overshooting and Higher Heavy-Element Opacity
It is shown that a moderate increase of the opacity due to heavy elements in models of massive stars, incorporating convective overshoot and mass loss by stellar wind, can remove the well known discrepancy between theoretical expectation and observed frequencies of luminous stars in the HR diagram. These models in fact extend their main sequence band far beyond the classical limit.
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