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Placco, Vinicius M.; Almeida-Fernandes, Felipe; Holmbeck, Erika M.; Roederer, Ian U.; Mardini, Mohammad K.; Hayes, Christian R.; Venn, Kim; Chiboucas, Kristin; Deibert, Emily; Gamen, Roberto; Heo, Jeong-Eun; Jeong, Miji; Kalari, Venu; Martioli, Eder; Xu, Siyi; Diaz, Ruben; Gomez-Jimenez, Manuel; Henderson, David; Prado, Pablo; Quiroz, Carlos; Ruiz-Carmona, Roque; Simpson, Chris; Urrutia, Cristian; McConnachie, Alan W.; Pazder, John; Burley, Gregory; Ireland, Michael; Waller, Fletcher; Berg, Trystyn A. M.; Robertson, J. Gordon; Hartman, Zachary; Jones, David O.; Labrie, Kathleen; Perez, Gabriel; Ridgway, Susan; Thomas-Osip, Joanna
The Astrophysical journal, 12/2023, Letnik: 959, Številka: 1Journal Article
Abstract We report on a chemo-dynamical analysis of SPLUS J142445.34−254247.1 (SPLUS J1424−2542), an extremely metal-poor halo star enhanced in elements formed by the rapid neutron-capture process ( r -process). This star was first selected as a metal-poor candidate from its narrowband S-PLUS photometry and followed up spectroscopically in medium resolution with Gemini-South/GMOS, which confirmed its low-metallicity status. High-resolution spectroscopy was gathered with GHOST at Gemini-South, allowing for the determination of the chemical abundances for 36 elements, from carbon to thorium. At Fe/H = −3.39, SPLUS J1424−2542 is one of the lowest-metallicity stars with measured Th and has the highest log ϵ ( Th / Eu ) observed to date, making it part of the “actinide-boost” category of r -process–enhanced stars. The analysis presented here suggests that the gas cloud from which SPLUS J1424−2542 formed must have been enriched by at least two progenitor populations. The light-element ( Z ≤ 30) abundance pattern is consistent with the yields from a supernova explosion of metal-free stars with 11.3–13.4 M ⊙ , and the heavy-element ( Z ≥ 38) abundance pattern can be reproduced by the yields from a neutron star merger (1.66 M ⊙ and 1.27 M ⊙ ) event. A kinematical analysis also reveals that SPLUS J1424−2542 is a low-mass, old halo star with a likely in situ origin, not associated with any known early merger events in the Milky Way.
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