Metal-poor star RAVE J093730.5-062655 abundances

DOI

A new moderately r-process-enhanced metal-poor star, RAVEJ093730.5-062655, has been identified in the Milky Way halo as part of an ongoing survey by the R-Process Alliance. The temperature and surface gravity indicate that J0937-0626 is likely a horizontal branch star. At [Fe/H]=-1.86, J0937-0626 is found to have subsolar [X/Fe] ratios for nearly every light, {alpha}, and Fe-peak element. The low [{alpha}/Fe] ratios can be explained by an ~0.6dex excess of Fe; J0937-0626 is therefore similar to the subclass of "iron-enhanced" metal-poor stars. A comparison with Milky Way field stars at [Fe/H]=-2.5 suggests that J0937-0626 was enriched in material from an event, possibly a Type Ia supernova, that created a significant amount of Cr, Mn, Fe, and Ni and smaller amounts of Ca, Sc, Ti, and Zn. The r-process enhancement of J0937-0626 is likely due to a separate event, which suggests that its birth environment was highly enriched in r-process elements. The kinematics of J0937-0626, based on Gaia DR2 data, indicate a retrograde orbit in the Milky Way halo; J0937-0626 was therefore likely accreted from a dwarf galaxy that had significant r-process enrichment.

Identifier
DOI http://doi.org/10.26093/cds/vizier.18740148
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/ApJ/874/148
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/874/148
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/874/148
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/ApJ/874/148
Provenance
Creator Sakari C.M.; Roederer I.U.; Placco V.M.; Beers T.C.; Ezzeddine R.,Frebel A.; Hansen T.; Sneden C.; Cowan J.J.; Wallerstein G.; Farrell E.M.,Venn K.A.; Matijevic G.; Wyse R.F.G.; Bland-Hawthorn J.; Chiappini C.,Freeman K.C.; Gibson B.K.; Grebel E.K.; Helmi A.; Kordopatis G.; Kunder A.,Navarro J.; Reid W.; Seabroke G.; Steinmetz M.; Watson F.
Publisher CDS
Publication Year 2020
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; Galactic and extragalactic Astronomy; Interdisciplinary Astronomy; Natural Sciences; Observational Astronomy; Physics; Stellar Astronomy