RAVE J203843.2–002333: The First Highly R-process-enhanced Star Identified in the RAVE Survey
Author(s)Placco, Vinicius M.; Holmbeck, Erika M.; Beers, Timothy C.; Surman, Rebecca A.; Points, Sean D.; Kaleida, Catherine C.; Hansen, Terese T.; Sakari, Charli M.; Casey, Andrew R.; Frebel, Anna L.; Ji, Alexander Pung; Ezzeddine, Rana; ... Show more Show less
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We report the discovery of RAVE J203843.2-002333, a bright (V = 12.73), very metal-poor ([Fe/H] = -2.91), r-process-enhanced ([Ba/Eu] = +1.64 and = -0.81) star selected from the RAVE survey. This star was identified as a metal-poor candidate based on its medium-resolution (R ∼ 1600) spectrum obtained with the KPNO/Mayall Telescope, and followed up with high-resolution (R ∼ 66,000) spectroscopy with the Magellan/Clay Telescope, allowing for the determination of elemental abundances for 24 neutron-capture elements, including thorium and uranium. RAVE J2038-0023 is only the fourth metal-poor star with a clearly measured U abundance. The derived chemical abundance pattern exhibits good agreement with those of other known highly r-process-enhanced stars, and evidence suggests that it is not an actinide-boost star. Age estimates were calculated using U/X abundance ratios, yielding a mean age of 13.0 ± 1.1 Gyr.
DepartmentMassachusetts Institute of Technology. Department of Physics; MIT Kavli Institute for Astrophysics and Space Research
The Astrophysical Journal
Placco, Vinicius M., et al. “RAVE J203843.2–002333: The First Highly R-Process-Enhanced Star Identified in the RAVE Survey.” The Astrophysical Journal, vol. 844, no. 1, July 2017, p. 18. © 2017 The American Astronomical Society
Final published version