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Dynamical Shear Instability

Published online by Cambridge University Press:  26 May 2016

Raphael Hirschi ,
André Maeder  and
Georges Meynet
Raphael Hirschi
Affiliation:
Geneva Observatory, CH–1290 Sauverny, Switzerland
André Maeder
Affiliation:
Geneva Observatory, CH–1290 Sauverny, Switzerland
Georges Meynet
Affiliation:
Geneva Observatory, CH–1290 Sauverny, Switzerland

Abstract

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The dynamical shear instability is an important mixing process in the advanced stages of the evolution of massive stars. We calculated different models of 15 M⊙ with an initial rotational velocity, vini = 300 km/s to investigate its efficiency. We found that the dynamical shear instability has a timescale shorter than oxygen burning timescale and that it slightly enlarges the convective zones and smoothens the omega gradients throughout the evolution. However, its effect is too localized to slow down the core of the star.

Type
Session 4 Rotation and Stellar Evolution
Information
Symposium - International Astronomical Union , Volume 215: Stellar Rotation , 2004 , pp. 510 - 511
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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