On the evidence of extra mixing in models of 8 M⊙ computed with the new solar abundances
Département AGO, Université de Liège, 17 allée du 6 Août, 4000 Liège, Belgium
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Stars more massive than about 3M⊙ are known to experience loops in the HR diagram during their core helium burning phase. Except for very massive stars the extent of their loops increases with the stellar mass. We show that a stellar evolution track for a 8M⊙ star computed with the new solar abundances  shows only a very tiny loop located near the red giant branch. An overshooting below the convective envelope is required to obtain a H-discontinuity located deep enough in the μ-gradient region and thus to allow the development of a loop in the HR diagram.
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