Extinction law in the range 0.4-4.8 $\mu$m and the 8620 $\mathring{A}$ DIB towards the stellar cluster Westerlund 1

Augusto Damineli, Leonardo A. Almeida, Robert D. Blum +4

The young stellar cluster Westerlund 1 (Wd 1: $l$=339.6${}^{\circ }$, b=$-$0.4${}^{\circ }$) is one of the most massive in the local Universe, but accurate parameters are pending on better d…