LAUSR

This study in based on observations collected at the European Southern Observatory. We are very grateful to our referee for providing constructive comments and help in improving the manuscript. This work has been partially funded by research project AYA2017-79724-C4-4-P from the Spanish PNAYA. CK, JMV, SDP, and JI-P acknowledge financial support from Junta de Andalucia Excellence Project PEX2011-FQM705. MAG acknowledges support of the grant AYA 2014-57280-P, co-funded with FEDER funds. LKH thanks the Instituto de Astrofisica de Andalucia-CSIC for warm hospitality in the visit during which the work for this paper was initiated. This work made use of the v2.1 of the Binary Population and Spectral Synthesis (BPASS) models as last described in Eldridge et al. (2017).