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New models for Wolf-Rayet stars: global diffusion

Published online by Cambridge University Press:  07 August 2017

L. Deng ,
A. Bressan  and
C. Chiosi
L. Deng
Affiliation:
1International School for Advanced Studies, Strada Costiera 11, 1-34100, Trieste, Italy
A. Bressan
Affiliation:
2 Astronomical Observatory, Vicolo Osservatorio 5, I-35100 Padova, Italy
C. Chiosi
Affiliation:
3 Department of Astronomy, University of Padova, Vicolo Osservatorio 5, 35122 Padova, Italy

Abstract

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We present a scenario for the evolution of massive stars in which a new mixing mechanism (named global diffusion) is taken into account. This type of mixing stands on the critical Reynolds number and radiative viscosity (Schatzman 1977) and allows mixing of material to take place between the core and the surface during the whole evolution on a very slow time scale. The physical processes triggering global diffusion deserve further study. We find that stellar models of massive stars calculated with global diffusion offer interesting clues to understanding the properties of Wolf-Rayet stars and their location in the HRD.

Keywords

stars: Wolf-Rayetevolutionmixing processes
Type
Session V - poster summaries
Information
Symposium - International Astronomical Union , Volume 163: Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution , 1995 , pp. 320 - 321
Copyright
Copyright © Kluwer 1995 

References

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Hamann, W.R., Koesterke, L., Wessolowski, U. 1993, A&A 274, 397 Google Scholar
Schaller, G., Schaerer, D., Meynet, G., Maeder, A. 1992, A&A Suppl. 96, 269 Google Scholar
Schatzman, E. 1977, A&A 56, 211 Google Scholar