Speaker
Description
The trans-iron elements with atomic numbers 27 < Z < 52 are still not well
understood (Peterson et al. 2020, A&A, 638, A64). There is some evidence
for Ge to be classified rather as an iron-peak element than a neutron-capture
element. In particular, abundances of
Cobalt and Copper are of interest to elucidate their origin as
neutron capture elements on iron-group nuclei during He burning and later
burning stages, also called the weak-s component
(Limongi & Chieffi 2003, ApJ, 592, 404), and the alpha-rich freeze-out
in the deepest
layers (Sukhbold et al. 2016, ApJ, 821, 38).
Abundances in old stars of the Galactic bulge tend to show that
conclude that both Co and Cu appear to be more dominantly produced rather by
a weak s-process than by alpha-rich freeze-out.
