3D hydro dynamical model stellar atmospheres of metal-poor red giants

Abstract

We investigate the main differences between static 1D and 3D time-dependent model stellar atmospheres of red giants at very low metallicities. We focus in particular on the impact of 3D LTE spectral line formation on the derivation of elemental abundances for the extremely metal-poor ([Fe/H] ≈ -5.3) red giant HE 0107-5240. © 2005 International Astronomical Union.