The impact of semi-convection and overshooting on the surface abundances in massive stars |
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| Authors: | N Mowlavi M Forestini A Jorissen |
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| Institution: | (1) Institut d'Astronomie et d'Astrophysique, Universite Libre de Bruxelles, Av. F-D. Roosevelt, 50, C.P. 165, B-1050 Bruxelles, Belgium;(2) Present address: Observatoire de Grenoble, Laboratoire d'Astrophysique, Rue de la Piscine, 414, BP53X, F-38041 Grenoble Cedex, France |
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| Abstract: | We analyse the effects of semi-convection and overshooting on the predicted surface abundances after the first and second dredge-ups in 15 and 20 M Pop. I stars. Overshooting is applied either to the core boundary or to the boundaries of all convective zones. It is shown that the surface abundances are sensitive to the mixing scheme adopted in the interior. The models including semi-convection lead to lower12C/13C ratios than the other mixing schemes, while models with overshooting predict higher enhancements of sodium at the surface. |
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