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Proceedings Paper

Alpha Ori imaging science
Author(s): Bernd Freytag
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Paper Abstract

Three-dimensional radiation hydrodynamics simulation of the convective envelope and the atmosphere of a red supergiant (e.g. α Ori) have been performed, including ionization effects and realistic (grey) opacities. Only a handful of giant convection cells with lifetimes up to a few years are found in the envelope. The stellar surface itself is covered with smaller short-lived cells related to the well-known solar granulation but differing in many ways. Pressure fluctuations, acoustic waves, and shocks play an important role affecting the surface energy fluxes and accordingly the emitted intensity. The interaction with convection and waves generates observable large-scale high-contrast surface features. The complexity of the surface structures in the numerical models which will probably be even higher in nature calls for interferometric observations with high spatial and some temporal resolution. The comparison with the results of numerical simulations will allow to deduce information about the nature of the surface phenomena and fundamental stellar parameters.

Paper Details

Date Published: 21 February 2003
PDF: 10 pages
Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); doi: 10.1117/12.458826
Show Author Affiliations
Bernd Freytag, Uppsala Univ. (Sweden)

Published in SPIE Proceedings Vol. 4838:
Interferometry for Optical Astronomy II
Wesley A. Traub, Editor(s)

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