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

  • Authors: Miji Jeong, Young Sun Lee, 영선 이, Vinicius M. Placco, Yutaka Hirai, Timothy C. Beers, Jeong-Eun Heo, Kristin Chiboucas, Emily Deibert, Roberto Gamen, Venu M. Kalari, Eder Martioli, Ruben Diaz, Manuel Gomez- Jimenez, Roque Ruiz-Carmona, Greg Burley, J. Gordon Robertson, Kathleen Labrie, Joanna Thomas-Osip

Miji Jeong et al 2026 The Astrophysical Journal 1005 .

  • Provider: AAS Journals

Caption: Figure 5.

Upper panel: abundance ratios ([X/Fe]) of J1222 for heavier elements (Z ≥ 35) as a function of atomic number (Z). The red dots represent the measured abundances with their uncertainties (see Table 2). The orange line shows the scaled-solar s-process pattern, normalized to the Ba abundance of J1222, while the cyan line represents the scaled-solar r-process pattern, normalized to the Eu abundance of J1222. The solar reference values are taken from M. Asplund et al. (2009), and the s- and r-process contributions for each element are based on Table 5 from D. L. Burris et al. (2000). The numbers around each element symbol are the production fraction of s- (orange) and r-process (green) from D. L. Burris et al. (2000). Lower panel: residuals between the observed abundances of J1222 and the scaled-solar s- and r-process patterns ([X/Fe] − [X/Fe]s or [X/Fe] − [X/Fe]r).

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