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Critical Metallicity for Post-Pop III Stars

Published online by Cambridge University Press:  21 April 2007

E. Emsellem ,
H. Wozniak ,
G. Massacrier ,
J.-F. Gonzalez ,
J. Devriendt ,
N. Champavert ,
E.O. Vasiliev  and
Y.A. Shchekinov
E.O. Vasiliev
Affiliation:
Tartu Observatory, 61602 Tõravere, Estonia & Inst of Physics, University of Rostov, 344090 Rostov-on-Don, Russia
Y.A. Shchekinov
Affiliation:
Dept. of Physics, University of Rostov, 344090 Rostov-on-Don, Russia
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Abstract

We examine the role of primordial molecules in the Pop III to Pop II transition. We show that the critical metallicity strongly depends on H2/HD abundances and thermal history of gas. In a shock processed gas where H2 and HD are highly abundant the dependence of the critical metallicity on gas density is very steep at n ~ 100 cm-3 and T ≤ 300 K, and can become smaller than 10-6.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 24: CRAL-2006. Chemodynamics: From First Stars to Local Galaxies , 2007 , pp. 295 - 296
Copyright
© EAS, EDP Sciences, 2007

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