Extended Data Fig. 5: Comparison of the expansion opacities at modest optical depths for Sr and Ce.
From: Identification of strontium in the merger of two neutron stars
This calculation shows the potential of Sr to dominate the opacity at around 1 μm at low optical depths. The opacities are based on LTE calculations for a gas at a temperature of 5,000 K, a mean local density of 8.4 × 10−17 g cm−3 for Sr or Ce, an electron density of 7.6 × 108 cm−3, and a 1% atmospheric radius at 1.5 days after the explosion. Line lists used for Sr and Ce are from the Kurucz and VALD databases respectively.
