Constraints on rotational mixing from surface evolution of light elements in massive stars

Frischknecht, U. and Hirschi, R. and Meynet, G. and Ekström, S. and Georgy, C. and Rauscher, T. and Winteler, C. and Thielemann, F.-K.. (2010) Constraints on rotational mixing from surface evolution of light elements in massive stars. Astronomy & astrophysics, Vol. 522 , A39.

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Official URL: http://edoc.unibas.ch/dok/A5840161

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Context. Light elements and nitrogen surface abundances together can constrain the mixing efficiencies in massive stars on the main sequence, because moderate mixing in the surface layers leads to depletion of light elements but only later to enrichment in nitrogen. Aims. We want to test the rotational mixing prescriptions included in the Geneva stellar evolution code (GENEC) by following the evolution of surface abundances of light isotopes in massive stars. Methods. The GENEC is a 1D code containing sophisticated prescriptions for rotational mixing. We implemented an extended reaction network into this code including the light elements Li, Be, and B, which allowed us to perform calculations testing the rotation-induced mixing. Results. We followed 9, 12, and 15  models with rotation from the zero age main sequence up to the end of He burning. The calculations show the expected behaviour with faster depletion of light isotopes for faster rotating stars and more massive stars. Conclusions. We find that the mixing prescriptions used in the present rotating models for massive single stars can account for most of the observations; however, the uncertainties are quite large, making it hard to draw a firm conclusion on the mixing scenario.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas and Thielemann, Friedrich-Karl and Winteler, Christian and Frischknecht, Urs
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:11 Oct 2012 15:29
Deposited On:14 Sep 2012 06:47

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