Solar abundances and 3D model atmospheres

Hans-Günter Ludwig (1, 2, 3) , Elisabetta Caffau (2, 3) , Matthias Steffen (4) , Piercarlo Bonifacio (1, 2, 3) , Bernd Freytag (1, 2, 3) , Roger Cayrel (2, 3)

1 CIFIST - Cosmological Impact of the First Stars
2 GEPI - Galaxies, Etoiles, Physique, Instrumentation
3 Physique stellaire et galactique
4 AIP - Astrophysikalisches Institut Potsdam

We present solar photospheric abundances for 12 elements from optical and near-infrared spectroscopy. The abundance analysis was conducted employing 3D hydrodynamical (CO⁵BOLD) as well as standard 1D hydrostatic model atmospheres. We compare our results to others with emphasis on discrepancies and still lingering problems, in particular exemplified by the pivotal abundance of oxygen. We argue that the thermal structure of the lower solar photosphere is very well represented by our 3D model. We obtain an excellent match of the observed center-to-limb variation of the line-blanketed continuum intensity, also at wavelengths shortward of the Balmer jump.

Domaines: Astrophysique [astro-ph]

Hans-Günter Ludwig, Elisabetta Caffau, Matthias Steffen, Piercarlo Bonifacio, Bernd Freytag, et al.. Solar abundances and 3D model atmospheres. Chemical Abundances in the Universe - Connecting First Stars to Planets, IAU Symposium 265, Aug 2009, Rio de Janeiro, Brazil, Brazil. pp.201-204, ⟨10.1017/S1743921310000542⟩. ⟨hal-03743930⟩