Comparison of theoretical radiation-driven winds from stars and discs

Abstract

We compare models of line-driven winds from accretion discs and single spherical stars. We look at the problem of scaling mass-loss rates and velocities of stellar and disc winds with model parameters. We find that stellar and disc winds driven by radiation, within the Castor-Abbott-Klein (CAK) framework, are very similar as far as mass-loss rates and velocities are concerned. Thus we can use analytic results for stellar winds to rescale, in a first-order approximation, numerical results for disc winds. We also show how the CAK stellar solutions change when we take into account effects of very low luminosities or line-driving force.