The winds of hot massive first stars

¹ Ústav teoretické fyziky a astrofyziky, Přírodovědecká fakulta Masarykovy univerzity, 611 37 Brno, Czech Republic e-mail: krticka@physics.muni.cz
² Astronomický ústav, Akademie věd České republiky, 251 65 Ondřejov, Czech Republic

Received: 22 April 2005
Accepted: 21 August 2005

Abstract

We study dynamical aspects of the circumstellar environment around massive zero-metallicity first stars. We apply our NLTE wind models showing that the hydrogen-helium stellar wind from stationary massive first generation (Population III) stars (driven either by the line (bound-bound) or continuum (bound-free and free-free) transitions) is unlikely. The possibility of expulsion of chemically homogeneous wind and the role of minor isotopes are discussed. We estimate the importance of hydrogen and helium lines in shutting off the initial accretion onto first stars and its influence on the initial mass function of first stars.