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Issue A&A
Volume 372, Number 2, June III 2001
Page(s) 579 - 582
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010521



A&A 372, 579-582 (2001)
DOI: 10.1051/0004-6361:20010521

Massive zero-metal stars: Energy production and mixing

C. W. Straka and W. M. Tscharnuter

Institut für Theoretische Astrophysik, Universität Heidelberg, Tiergartenstraße 15, 69121 Heidelberg, Germany

(Received 21 March 2001 / Accepted 2 April 2001 )

Abstract
Time-dependent nuclear network calculations at constant temperature show that for zero-metal stars $\gtrsim$ $20 M_{\odot}$ (i) $\beta$-decay reactions and (ii) the 13N(p,$\gamma$)14O reaction must be included. It is also shown that the nuclear timescale in these zero-metal stars is shorter than the mixing timescale and therefore the assumption of instantaneous mixing across convective regions is not fulfilled. We conclude that proper modeling of these processes may alter the evolution of massive zero-metal stars.


Key words: nuclear reactions -- convection -- stars: evolution

Offprint request: C. W. Straka, cstraka@ita.uni-heidelberg.de




© ESO 2001

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