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Title:
On the origin of microturbulence in hot stars
Authors:
Cantiello, M.; Langer, N.; Brott, I.; de Koter, A.; Shore, S. N.; Vink, J. S.; Voegler, A.; Yoon, S.-C.
Publication:
Communications in Asteroseismology, Vol.158, p. 61 Proceedings of "38th Liege International Astrophysical Colloquium: Evolution and Pulsation of Massive Stars on the Main Sequence and Close to it", held on July 7-11 2008, edited by Arlette Noels, Conny Aerts, Josefina Montalban, Andrea Miglio and Maryline Briquet. (CoAst Homepage)
Publication Date:
07/2009
Origin:
AASP
Bibliographic Code:
2009CoAst.158...61C

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. The region in the Hertzsprung-Russel diagram in which we predict the convection zones and the strength of this convection is in good agreement with the occurrence and strength of microturbulence in massive stars. We further argue that convection close to the surface may trigger clumping at the base of the stellar wind of hot massive stars.

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