On the absolute age of the metal-rich globular M71 (NGC 6838): I. optical photometry

Alessandra Di Cecco, Giuseppe Bono, Pier Giorgio Prada Moroni +9

We investigated the absolute age of the Galactic globular cluster M71 (NGC 6838) by using optical ground-based images (u',g',r',i',z') collected with the MegaCam camera at the Cana…