Tabulations for line-opacity calculation

We fitted the opacity computed from the line-list with an analytic result derived for an assumed distribution of the spectral line strength and found the corresponding line-distribution parameters, which we here tabulated for a range of assumed input densities {rho} in [10^-20^, 10^-10^]g/cm^3^ and temperatures T in [10^4^, 10^4.7^]K. We found that the variation of the line distribution parameters plays an essential role in setting the wind dynamics in our models.

In our benchmark study, we also found a good overall agreement between the O-star mass-loss rates of our models and those derived from steady-state studies using more detailed radiative transfer. Our models reinforce that self-consistent variation of the line-distribution parameters is important for the dynamics of line-driven flows. Within a well-calibrated O-star regime, our results support the proposed methodology.

In practice, utilising the provided tables, yielded a factor >100 speed-up in computational time compared to specialised 1-D model-atmosphere codes of line-driven winds, which constitutes an important step towards efficient multi-D simulations. We conclude that our method and tables are ready to be exploited in various radiation-hydrodynamic simulations where the line force is important.