New mass-loss rates of B supergiants from global wind models

摘要: Massive stars lose a significant fraction of mass during their evolution. However, the corresponding mass-loss rates are rather uncertain. To improve this, we calculated global line-driven wind models for Galactic B supergiants. Our predict radial structure directly from basic stellar parameters. The hydrodynamic flow is consistently determined photosphere in nearly hydrostatic equilibrium to supersonically expanding wind. radiative force derived solution transfer equation comoving frame. We provide simple formula that predicts theoretical as function luminosity and effective temperature. rate supergiants slightly decreases with temperature down about 22.5 kK, where region recombination Fe IV III starts appear. In this region, which 5 kK wide, gradually increases by factor 6. increase associated gradual decrease terminal velocities 2. compared predicted parameters observations. While observed reasonably reproduced models, situation less clear. observations uncorrected clumping 3 9 higher than our predictions on cool hot sides studied sample, respectively. These can be reconciled theory assuming temperature-dependent factor. On other hand, estimates not sensitive agree much better. 10 lower values currently used evolutionary appealing reconsideration role winds