SAC Seminar - Maurizio Salaris: Lithium in old stars, mixing and big bang nucleosynthesis: old problems, new ideas, any solution?
Oplysninger om arrangementet
Speaker: Maurizio Salaris, Astrophysics Research Institute, Liverpool John Moores University, UK
Title: Lithium in old stars, mixing and big bang nucleosynthesis: old problems, new ideas, any solution?
The abundance of Lithium in the atmospheres of Pop II dwarfs has become a serious problem, after the recent tight constraints on the cosmological baryon density.
Is there 'missing physics' (read element transport mechanisms) in stellar models of low-mass stars? Did some pre-Galactic chemical processing affect the Li-abundances we observe now ?
Do we need to add new physics to Big Bang nucleosynthesis calculations ?
A brief review of the available data will be presented, together with their interpretation according to stellar evolution modelling, new ideas based on measuring Li in low-luminosity red giants, and hopes that asteroseismology may one day come to the rescue.