BSS and RGB samples selection. Left panel: near-UV CMD of NGC 1835, with the selected BSS sample shown with blue circles. The rightmost solid line is the evolutionary track corresponding to a mass of 0.8 M_⊙. The leftmost solid line is the evolutionary track of a 1 M_⊙ mass. The dotted line is the PARSEC isochrone corresponding to a very young age (40 Myr), representing the cluster ZAMS. Right panel: optical CMD of NGC 1835, with the selected RGB sample shown with red circles.