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Accueil > Séminaires > Archive des séminaires d’Utinam > 2020

Gražina Tautvaisiene

Carbon and nitrogen as probes of mixing processes in giant stars

mardi 21 janvier 2020, 10h45

salle de conférences de l’observatoire

Gražina Tautvaisiene

Institut de Physique Théorique et d’Astronomie, Université de Vilnius (Lituanie)

Mots-clés :
Astrophysique ; spectroscopie ; évolution stellaire

Résumé :

Carbon, nitrogen, and oxygen are among the first elements to form in the nucleosynthesis chain and comprise most of the mass of elements heavier than helium. These elements play important roles in stellar interior as sources of opacity and energy production through the CNO cycle, and thus affect the star’s lifetime, its position in the Hertzsprung-Russell diagramme, and its heavy-element yields. Carbon and its isotopes as well as nitrogen give a comprehensive information on material mixing during stellar evolution. I will present the ongoing work on CNO abundances in Galactic open cluster and field stars in the context of stellar and Galactic evolution modelling.