Opacity modelling of heavy-metal hot subdwarfs. Photoionization of Sr${}^0$, Y${}^{+}$ and Zr${}^{2+}$

L. Fernández-Menchero, C. S. Jeffery, C. A. Ramsbottom +1

Heavy-metal hot subdwarfs (sdB and sdO) represent a small group of stars with unusually high concentrations of trans-iron elements in their atmospheres, having abundances ~ 10000 t…