RAVE J203843.2-002333 high-resolution spectroscopy

DOI

We report the discovery of RAVE J203843.2-002333, a bright (V=12.73), very metal-poor ([Fe/H]=-2.91), r-process-enhanced ([Eu/Fe]=+1.64 and [Ba/Eu]=-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~66000) 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+/-1.1Gyr.

Identifier
DOI http://doi.org/10.26093/cds/vizier.18440018
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/ApJ/844/18
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/844/18
Related Identifier https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/844/18
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/ApJ/844/18
Provenance
Creator Placco V.M.; Holmbeck E.M.; Frebel A.; Beers T.C.; Surman R.A.; Ji A.P.,Ezzeddine R.; Points S.D.; Kaleida C.C.; Hansen T.T.; Sakari C.M.,Casey A.R.
Publisher CDS
Publication Year 2018
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Interdisciplinary Astronomy; Natural Sciences; Observational Astronomy; Physics; Stellar Astronomy