2020A&A...643A..88Z

Aims. We present a database of 43 340 atmospheric models (∼80 000 models at the conclusion of the project) for stars with stellar masses between 9 and 120 M_☉, covering the region of the OB main-sequence and Wolf-Rayet stars in the Hertzsprung-Russell diagram.
Methods. The models were calculated using the ABACUS I supercomputer and the stellar atmosphere code CMFGEN.
Results. The parameter space has six dimensions: the effective temperature T_eff, the luminosity L, the metallicity Z, and three stellar wind parameters: the exponent β, the terminal velocity V_∞, and the volume filling factor F_cl. For each model, we also calculate synthetic spectra in the UV (900-2000Å), optical (3500-7000Å), and near-IR (10000-40000Å) regions. To facilitate comparison with observations, the synthetic spectra can be rotationally broadened using ROTIN3, by covering vsini velocities between 10 and 350km/s with steps of 10km/s.
Conclusions. We also present the results of the reanalysis of ε Ori using our grid to demonstrate the benefits of databases of precalculated models. Our analysis succeeded in reproducing the best-fit parameter ranges of the original study, although our results favor the higher end of the mass-loss range and a lower level of clumping. Our results indirectly suggest that the resonance lines in the UV range are strongly affected by the velocity-space porosity, as has been suggested by recent theoretical calculations and numerical simulations.