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Accueil > Séminaires > Archive des séminaires d’Utinam > 2013

Elisabetta Caffau

The first stars

jeudi 25 avril 2013, 10h30

salle de conférences de l’observatoire

Elisabetta Caffau, Zentrum für Astronomie, Université d’Heidelberg

Lauréate du prix MERAC 2013 de la Société astronomique européenne

Résumé :

The extremely metal-poor stars (EMP) hold in their atmospheres the fossil record of the chemical composition of the early phases of the Galactic evolution. The chemical analysis of such objects provides important constraints on these early phases.
EMP stars are very rare objects ; to dig them out large amounts of data have to be considered.
With an automatic procedure, we analysed objects with colours of Turn-Off stars from the Sloan Digital Sky Survey to select a sample of good candidate EMP stars.
During the French-Italian GTO of the spectrograph X-Shooter, we observed a sample of these candidates.
We could confirm the low metallicity of our sample of stars, and we succeeded in finding a record metal-poor star.