EAS Publications Series
Volume 24, 2007CRAL-2006. Chemodynamics: From First Stars to Local Galaxies
|Page(s)||295 - 296|
|Published online||21 April 2007|
E. Emsellem, H. Wozniak, G. Massacrier, J.-F. Gonzalez, J. Devriendt and N. Champavert (eds)
EAS Publications Series, 24 (2007) 295-296
Critical Metallicity for Post-Pop III Stars
Tartu Observatory, 61602 Tõravere, Estonia
& Inst of Physics, University of Rostov, 344090 Rostov-on-Don, Russia
2 Dept. of Physics, University of Rostov, 344090 Rostov-on-Don, Russia
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.
© EAS, EDP Sciences, 2007
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