Observatoire de Paris Institut national de recherche scientifique français Univerité Pierre et Marie Curie Université Paris Diderot - Paris 7

The solar photospheric abundances

jeudi 11 septembre 2008, par Hans Ludwig (CIFIST, GEPI, Observatoire de Paris-Meudon)

Mardi 13 mai 2008 à 11h00 , Lieu : (Salle de conférence du bât. 17)

I shall give a summary of what is known about the elemental abundances in the solar photosphere from the viewpoint of spectroscopy. Emphasis will be laid on elements that have been subject to investigation in the CIFIST group at the Observatoire de Paris-Meudon, in particular the elements oxygen and thorium. I discuss the role of 3D hydrodynamical model atmospheres for abundance determinations, and point out limitations that need to be overcome to obtain higher fidelity abundances. To motivate the investigations I relate the them to open astrophysical issues in helioseismology and nucleosynthesis.