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Starburst99 is a comprehensive set of model predictions for spectrophotometric and related properties of galaxies with active star formation. The models are presented in a homogeneous way for five metallicities between Z = 0.040 and 0.001 and three choices of the initial mass function. The age coverage is 10^6 to 10^9 yr. Spectral energy distributions are used to compute colors and other quantities.
pyStarburst99 is a Python version of the Starburst99 (ascl:1104.003) population synthesis code for star-forming galaxies. This Python version includes new evolutionary tracks and synthetic spectral energy distributions. pyStarburst99 provides wider coverage in metallicity, mass, and resolution, and includes evolutionary and spectral models of stars up to 300–500 M⊙.