The main goal of this study is to characterize the stellar populations in very low-metallicity galaxies. We have obtained broad U, B, R, I, J, H, K, intermediate Strömgren y and narrow H α and [O III] deep images of three southern H II galaxies with different morphology. We have analysed the intetraged flux and characterized the stellar cluster complexes (SCCs) and the H II regions in them. The stellar populations in the galaxies have been characterized by comparing the observed broad-band colours with those of single stellar population models. The physical properties (Age, Mass and Extinction) of a total of 240 SCCs was created. Only 10 SCCs are candidates to contain young massive clusters (age < 10 Myr and mass >= 10^5) like the ones observed in interacting or starburst galaxies like M82. In the three galaxies were found stellar clusters that can be taken as candidates to contain Wolf-Rayet stars in them. While only in one of the galaxies are observed SCCs likely dominated by Red Supergiant (RSG) stars, still further spectroscopic analysis is required. Our spatial-temporal analysis shows that star formation is more likely stochastic and simultaneous within short time-scales.
Enviado por astro@anatorrescampos.com, 2019 Oct