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The study of massive stars in different metallicity environments is a centraltopic of current stellar research. The spectral analysis of massive starsrequires adequate model atmospheres. The computation of such models isdifficult and time-consuming. Therefore, spectral analyses are greatlyfacilitated if they can refer to existing grids of models. Here we providegrids of model atmospheres for OB-type stars at metallicities corresponding tothe Small and Large Magellanic Clouds, as well as to solar metallicity. Intotal, the grids comprise 785 individual models. The models were calculatedusing the state-of-the-art Potsdam Wolf-Rayet (PoWR) model atmosphere code. Theparameter domain of the grids was set up using stellar evolution tracks. Forall these models, we provide normalized and flux-calibrated spectra, spectralenergy distributions, feedback parameters such as ionizing photons, Zanstratemperatures, and photometric magnitudes. The atmospheric structures (thedensity and temperature stratification) are available as well. All these dataare publicly accessible through the PoWR website.

PoWR grids of non-LTE model atmospheres for OB-type stars of various metallicities