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Astron. Astrophys. 324, 281-288 (1997)

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1-D and 2-D model atmospheres: iron and lithium LTE abundances in the Sun

A.S. Gadun and Ya.V. Pavlenko

The Main Astronomical Observatory of Academy of Sciences of Ukraine, Goloseevo, 252650 Kiev-22, Ukraine

Received 25 January 1996 / Accepted 15 January 1997

Abstract

We discuss LTE abundance determinations of iron and lithium in the solar atmosphere using a grid of one-dimensional (1-D) and two-dimensional (2-D) model atmospheres. These models differ mainly in the convection treatment. We found that the influence of atmospheric inhomogeneities on the iron abundance comprises [FORMULA] 0.1 dex for weak Fe I lines with low excitation potentials, and does not exceed [FORMULA] 0.05 dex for weak Fe II lines. 2-D models show lower iron abundances for Fe I lines. On the other hand, lithium abundances obtained for 1-D homogeneous and 2-D inhomogeneous model atmospheres differ up to 0.1-0.2 dex. 2-D model atmospheres result in lower lithium abundances, in contradiction with the recent suggestion of Kurucz (1995).

Key words: Sun: abundances – Sun: photosphere – line: formation

Send offprint requests to: Ya.V. Pavlenko

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© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998

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