Stellar winds and the circumstellar environment of massive first stars

We study dynamical aspects of circumstellar environment around massive first stars. We show that the stellar winds from stationary massive first generation (Population III) stars driven either by the line or continuum transitions are unlikely. Massive first stars are also unable to expel any element or isotope with a possible exception of ₁¹H. H-He stars with Eddington parameter Γ≳0.859 may have pure-hydrogen wind with mass-loss rates of order 10^-14M_⊙ year^-1. Finally, we show that hydrogen and helium lines could be important for shutting off the initial accretion onto first stars and may influence the initial mass function of first stars.