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We have modelled the stellar and nebular continua and emission-line intensityratios of massive stellar populations in the Antennae galaxy using highresolution and self-consistent libraries of model HII regions around centralclusters of aging stars. The model libraries are constructed using the stellarpopulation synthesis code, Starburst99, and photoionisation model, Cloudy. TheGeneva and PARSEC stellar evolutionary models are plugged into Starburst99 toallow comparison between the two models. Using a spectrum-fitting methodologythat allows the spectral features in the stellar and nebular continua (e.g.Wolf-Rayet features, Paschen jump), and emission-line diagnostics to constrainthe models, we apply the libraries to the high-resolution MUSE spectra of thestarbursting regions in the Antennae galaxy. Through this approach, we wereable to model the continuum emission from Wolf-Rayet stars and extract stellarand gas metallicities, ages, electron temperatures and densities of starburstsby exploiting the full spectrum. From the application to the Antennae galaxy,we find that (1) the starbursts in the Antennae galaxy are characterised bystellar and gas metallicities of around solar, (2) the star-forming gas instarbursts in the Western loop of NGC 4038 appear to be more enriched, albeitslightly, than the rest of galaxy, (3) the youngest starbursts are found acrossthe overlap region and over parts of the western-loop, though in comparison,the regions in the western-loop appear to be at a slightly later stage instar-formation than the overlap region, and (4) the results obtained fromfitting the Geneva and Parsec models are largely consistent.

Stellar populations and physical properties of starbursts in the Antennae galaxy from self-consistent modelling of MUSE spectra