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Communication Dans Un Congrès Année : 2008

3D model atmospheres and the solar photospheric oxygen abundance

Résumé

In recent years the photospheric solar oxygen abundance experienced a significant downward revision. However, a low photospheric abundance is incompatible with the value in the solar interior inferred from helioseismology. For contributing to the dispute whether the solar oxygen abundance is ``high'' or ``low'', we re-derived its photospheric abundance independently of previous analyses. We applied 3D (CO5BOLD) as well as 1D model atmospheres. We considered standard disc-centre and disc-integrated spectral atlases, as well as newly acquired solar intensity spectra at different heliocentric angles. We determined the oxygen abundances from equivalent width and/or line profile fitting of a number of atomic lines. As preliminary result, we find an oxygen abundance in the range 8.73 8.79, encompassing the value obtained by Holweger (2001), and somewhat higher than the value obtained by Asplund et al. (2005).

Dates et versions

hal-03743224 , version 1 (02-08-2022)

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Elisabetta Caffau, Hans-Günter Ludwig. 3D model atmospheres and the solar photospheric oxygen abundance. The Art of Modelling Stars in the 21st Century, IAU Symposium 252, Apr 2008, Sanya, Hainan Island, China, Nanjing, China. pp.35-39, ⟨10.1017/S1743921308022370⟩. ⟨hal-03743224⟩
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