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We present results of our calculations of NLTE model stellar atmospheres forhot Population III stars composed of hydrogen and helium. We use our owncomputer code for calculation of spherically symmetric NLTE model atmospheresin hydrostatic and radiative equilibrium. The model atmospheres are then usedfor calculation of emergent fluxes. These fluxes serve for the evaluation ofthe flow of high-energy photons for energies higher than ionization energies ofhydrogen and helium, the so-called ionizing photon fluxes. We also present thetime evolution of the ionizing photon fluxes.

Spherically symmetric NLTE model atmospheres of hot hydrogen-helium first stars