Topics on Galactic Chemical Evolution
  I discuss three different topics in Galactic chemical evolution:the "puzzling" absence of any observational signature of secondary elements ; the building of the Galactic halo in the framework of hierarchical galaxy formation, as evidenced from its metallicity distribution ; and the potentially important role that radial migration may play in the evolution of galactic disks, according to recent studies. 
Nikos Prantzos (UPMC and Institut d'Astrophysique de Paris)
astro-ph.GA