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m-dwarf stars 1near-infrared spectroscopy 1planetary mass and radius 1radial velocity 1stellar magnetic activity 1transiting exoplanets 1

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20242026
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astro-ph.GA2026

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 ((Th/Dy) = -0.74) star, LAMOST J122216.85-063345.2 (J1222), a very metal-poor ([Fe/H] = -2.45) halo s…