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SPLUS J142445.34–254247.1: An r-process–enhanced, Actinide-boost, Extremely Metal-poor Star Observed with GHOST

  • Authors: Vinicius M. Placco, Felipe Almeida-Fernandes, Erika M. Holmbeck, Ian U. Roederer, Mohammad K. Mardini, Christian R. Hayes, Kim Venn, Kristin Chiboucas, Emily Deibert, Roberto Gamen, Jeong-Eun Heo, Miji Jeong, Venu Kalari, Eder Martioli, Siyi Xu, Ruben Diaz, Manuel Gomez-Jimenez, David Henderson, Pablo Prado, Carlos Quiroz, Roque Ruiz-Carmona, Chris Simpson, Cristian Urrutia, Alan W. McConnachie, John Pazder, Gregory Burley, Michael Ireland, Fletcher Waller, Trystyn A. M. Berg, J. Gordon Robertson, Zachary Hartman, David O. Jones, Kathleen Labrie, Gabriel Perez, Susan Ridgway, Joanna Thomas-Osip

Vinicius M. Placco et al 2023 The Astrophysical Journal 959 .

  • Provider: AAS Journals

Caption: Figure 7.

Upper panel: heavy-element chemical abundance pattern of SPLUS J1424−2542, compared with the scaled solar system abundances. The r- and s-process contributions are calculated based on the fractions given by Burris et al. (2000) and scaled to match the observed abundances of Eu and Ba, respectively. Also shown are the r- and s-process fractions for each element (top), as well as the number of lines identified for each element (bottom). Open circles show the individual abundances for all the lines measured in the GHOST spectrum. Lower panel: residuals between the observations and the scaled solar system abundance patterns. A ±0.2 dex shaded area is shown for reference.

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