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On the origin of microturbulence in hot stars

Authors
  • Cantiello, M.
  • Langer, N.
  • Brott, I.
  • de Koter, A.
  • Shore, S. N.
  • Vink, J.
  • Voegler, A.
  • Yoon, S. -C.
Type
Preprint
Publication Date
Oct 15, 2008
Submission Date
Oct 15, 2008
Identifiers
arXiv ID: 0810.2546
Source
arXiv
License
Yellow
External links

Abstract

We present results from the first extensive study of convection zones in the envelopes of hot massive stars, which are caused by opacity peaks associated with iron and helium ionization. These convective regions can be located very close to the stellar surface. Recent observations of microturbulence in massive stars from the VLT-Flames survey are in good agreement with our predictions concerning the occurrence and the strength of sub-surface convection in hot stars. We argue further that convection close to the surface may trigger clumping at the base of the stellar wind of massive stars.

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