par Behara, Natalie Thérèse ;Ludwig, Hans Günter;Steffen, Matthias;Bonifacio, Piercarlo
Référence AIP Conference Proceedings, 1094, page (784-787)
Publication Publié, 2009
Article révisé par les pairs
Résumé : Balmer lines are recognized as accurate indicators of the effective temperature of late- type stars. The influence of convection on the shape of Balmer line profiles has been investigated using LTE 3D hydrodynamical model atmospheres and 'classical' LTE 1D stellar atmospheres, where convection is modeled within the simplistic picture of mixing-length theory. Models and line profiles computed with the CO5 BOLD and Linfor3D codes have been used to determine the effective temperatures of the Sun and three well known metal-poor stars HD84937, HD74000, and HD140283. Our 3D fit provides the best fit thus far for the solar Ha temperature using the Barklem theory. The resulting (3D-1D) Teff biases related to the different treatment of convection in the 1D and 3D models are presented. © 2009 American Institute of Physics.

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