The Actinide-Boost Star LAMOST J122216.85-063345.2: A Detailed R-process Abundance Study with Gemini-S/GHOST

Miji Jeong, Young Sun Lee, Vinicius M. Placco +15

We present a detailed chemical-abundance analysis of an actinide-boost ($\log \epsilon$(Th/Dy) = -0.74) star, LAMOST J122216.85-063345.2 (J1222), a very metal-poor ([Fe/H] = -2.45) halo st…