EAS Publications Series

Issue		EAS Publications Series Volume 18, 2006 Radiative Transfer and Applications to Very Large Telescopes
Page(s)		177 - 189
DOI		10.1051/eas:2006011
Published online		08 March 2006

Radiative Transfer and Applications to Very Large Telescopes
Ph. Stee (ed)
EAS Publications Series, 18 (2006) 177-189
DOI: 10.1051/eas:2006011

Radiative transfer in snapshots of 3D radiative hydrodynamic models of red supergiants

A. Chiavassa¹, B. Plez¹, E. Josselin¹ and B. Freytag²

¹ GRAAL, cc072, Université Montpellier II, 34095 Montpellier Cedex 05, France
² Department for Astronomy and Space Physics at Uppsala University, Box 515, 75120 Uppsala, Sweden

Abstract
Red Supergiant (RSG) represent a key-phase in the evolution of massive stars. These stars are characterized by strong mass loss of unknown origin. Observations show strong line profile fluctuations in depth, width and velocity, suggesting giant convective cells which could explain mass loss. Recently, radiative hydrodynamics (RHD) simulations of these stars show a peculiar convection pattern with giant cells. We performed 3D pure LTE radiative transfer calculations in snapshots of 3D hydrodynamical simulations taking into account the Doppler shifts caused by the convective motions. Computed spectra from RHD models qualitatively reproduce observations.

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