2004/11/22 by Michael Mayer, Wolfgang J. Duschl · 2 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Scientific Research and Discoveries #Statistical Mechanics and Entropy #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2005.08826.x
published as Mon.Not.Roy.Astron.Soc. 358 (2005) 614-631 · 16 pages, 8 figures, submitted to MNRAS, all figures in grey-scale and at reduced resolution, for high-res colour PDF see http://www.ita.uni-heidelberg.de/~mm/publications/MayerDuschl-2.pdf
arxiv created 2004/11/22 · openalex publication_date 2005/03/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 < logρ[g cm−3] < −2 and the temperature range of 1.8 < logT[K] < 4.6, while previous tables have usually been restricted to T > 103 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 two orders of magnitude relative to pure hydrogen/helium opacities.