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Fig. 8

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Top: temperature difference between atlas9 models with respect to marcs models (Gustafsson et al. 2008), for a metal-poor giant (Teff = 5000 K, log g = 2.0,  [Fe/H]  = −2.0, ξt = 2.0 km s-1). The dotted line represents an atlas9 model with scaled solar composition and convective overshoot from the Kurucz 1993-grid. The dashed line has the same composition, but without overshoot. The dashed-dotted line represents a 0.4 dex alpha-enhanced atlas9 model without overshoot from the 2004-grid by Castelli & Kurucz. Middle: difference between LTE abundance as function of line strength for the same models with respect to marcs. The abundances are based on the 819.4 nm Na I line and vary from left to right between  [Na/Fe]  = −2.0...    +2.0. Bottom: same as the middle panel, but for non-LTE abundances.

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