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.
Date Issued
July 2017
Journal
The Astrophysical Journal
Publisher
IOP Publishing
Citation
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
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
Terms of Use
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Persistent DSpace Link
DOI of Published Version
https://doi.org/10.3847/1538-4357/aa78ef
