  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.

Astrophysics