Ages and Age Spreads in Young Stellar Clusters
arXiv:1709.01736
Abstract
I review progress towards understanding the time-scales of star and cluster formation and of the absolute ages of young stars. I focus in particular on the areas in which Francesco Palla made highly significant contributions - interpretation of the Hertzsprung-Russell diagrams of young clusters and the role of photospheric lithium as an age diagnostic.
To appear in "Francesco's Legacy: Star Formation in Space and Time", Memorie della SAIt, in press. Eds. R. Cesaroni, E. Corbelli and D. Galli. 5pp