1-D AND 2-D MODEL ATMOSPHERES - IRON AND LITHIUM LTE ABUNDANCES IN THE SUN

We discuss LTE abundance determinations of iron and lithium in the sol ar atmosphere using a grid of one-dimensional (1-D) and two-dimensiona l (2-D) model atmospheres. These models differ mainly in the convectio n treatment. We found that the influence of atmospheric inhomogeneitie s on the iron abundance comprises similar to 0.1 dex for weak Fe I lin es with low excitation potentials, and does not exceed similar to 0.05 dex for weak Fe II lines. 2-D models show lower iron abundances for F e I lines. On the other hand, lithium abundances obtained for 1-D homo geneous and 2-D inhomogeneous model atmospheres differ up to 0.1-0.2 d ex. 2-D model atmospheres result in lower lithium abundances, in contr adiction with the recent suggestion of Kurucz (1995).