Program: GN-2007B-Q-44

How quick is chemical enrichment of the interstellar medium by massive stars? We will use GMOS-IFU to map the velocity fields and the chemical abundances in the nebular gas associated with the cores of a sample of nearby starburst regions, one object has been fully observed so far (NGC 2363-A) and one is in the queue for 2007A (NGC 5253). The goal of this spectral mapping is to explore the relations between the components of the velocity field (turbulence, super-shell expansion, and hypersonic blowout/breakout), the spatial abundance distribution and the ages/environments of two starburst clusters: NGC 2363-B and NGC 2403-II. We aim at establishing conditions under which immediate/local chemical enrichment takes place as opposed to the more diffuse and longer time scale mixing process. Our analysis will be supported by a detailed modelization of the evolution of starburst regions, using a stellar population evolutionary code, the MAPPINGS emission-line analysis code, an ASPH hydrodynamic algorithm.