3D MHD simulations of subsurface convection in OB stars

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Cantiello , M , Braithwaite , J , Brandenburg , A , Del Sordo , F , Käpylä , P & Langer , N 2011 , ' 3D MHD simulations of subsurface convection in OB stars ' in Active OB stars: structure, evolution, mass loss and critical limits , pp. 32-37 . , 10.1017/S174392131100994X

Title: 3D MHD simulations of subsurface convection in OB stars
Author: Cantiello, Matteo; Braithwaite, Jonathan; Brandenburg, Axel; Del Sordo, Fabio; Käpylä, Petri; Langer, Norbert
Contributor: University of Helsinki, Department of Physics
Belongs to series: Active OB stars: structure, evolution, mass loss and critical limits
Abstract: During their main sequence evolution, massive stars can develop convective regions very close to their surface. These regions are caused by an opacity peak associated with iron ionization. Cantiello et al. (2009) found a possible connection between the presence of sub-photospheric convective motions and small scale stochastic velocities in the photosphere of early-type stars. This supports a physical mechanism where microturbulence is caused by waves that are triggered by subsurface convection zones. They further suggest that clumping in the inner parts of the winds of OB stars could be related to subsurface convection, and that the convective layers may also be responsible for stochastic excitation of non-radial pulsations. Furthermore, magnetic fields produced in the iron convection zone could appear at the surface of such massive stars. Therefore subsurface convection could be responsible for the occurrence of observable phenomena such as line profile variability and discrete absorption components. These phenomena have been observed for decades, but still evade a clear theoretical explanation. Here we present preliminary results from 3D MHD simulations of such subsurface convection.
Peer review status: Non peer reviewed
URI: http://hdl.handle.net/10138/28870
Date: 2011
Subject: astro-ph.SR
astro-ph.EP
115 Astronomy, Space science


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