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Communication Dans Un Congrès Année : 2008

Hydrodynamical Model Atmospheres of Metal-Poor Stars

Résumé

Standard one-dimensional (1D) model atmospheres rely on the assumption of radiative equilibrium in the non-convective part of the stellar photosphere. However, gas-dynamical effects can lead to dramatic deviations from radiative equilibrium conditions, especially in metal-poor stellar atmospheres. These can be taken into account in 3D stellar atmosphere models representing the detailed interplay of hydrodynamics and radiation. During the last two years efforts have been invested to compute such 3D models for metal-poor atmospheres with the CO5 BOLD code within the CIFIST (Cosmological Impact of the FIrst STars) Team, an European Union funded research group dedicated to the study of metal-poor stars. Based on the available models we will give an account of the radiation-hydrodynamical processes at work, and discuss consequences for the temperature scale and abundance analysis of metal-poor stars.
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hal-03734657 , version 1 (21-07-2022)

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Hans-Günter Ludwig, J. I. González Hernández, Natalie Behara, Elisabetta Caffau, Matthias Steffen. Hydrodynamical Model Atmospheres of Metal-Poor Stars. First Stars III, Jul 2007, Santa Fe (New Mexico), Mexico. pp.268-272, ⟨10.1063/1.2905561⟩. ⟨hal-03734657⟩
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