Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-22
Mon.Not.Roy.Astron.Soc. 358 (2005) 614-631
Astronomy and Astrophysics
Astrophysics
16 pages, 8 figures, submitted to MNRAS, all figures in grey-scale and at reduced resolution, for high-res colour PDF see ht
Scientific paper
10.1111/j.1365-2966.2005.08826.x
We present newly calculated low-temperature opacities for gas with a primordial chemical composition. In contrast to earlier calculations which took a pure metal-free Hydrogen/Helium mixture, we take into account the small fractions of Deuterium and Lithium as resulting from Standard Big Bang Nucleosynthesis. Our opacity tables cover the density range -16 < log rho [g cm^{-3}] < -2 and temperature range of 1.8 < T [K] < 4.6, while previous tables were usually restricted to T > 10^3 K. We find that, while the presence of Deuterium does not significantly alter the opacity values, the presence of Lithium gives rise to major modifications of the opacities, at some points increasing it by approximately 2 orders of magnitude relative to pure Hydrogen/Helium opacities.
Duschl Wolfgang J.
Mayer Michael
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