RAVE J183013.5-455510 equivalent-width measurements

DOI

We report on the spectroscopic analysis of RAVE-J183013.5-455510, an extremely metal-poor star, highly enhanced in CNO, and with discernible contributions from the rapid neutron-capture process. There is no evidence of binarity for this object. At [Fe/H]=-3.57, this star has one of the lowest metallicities currently observed, with 18 measured abundances of neutron-capture elements. The presence of Ba, La, and Ce abundances above the solar system r-process predictions suggests that there must have been a non-standard source of r-process elements operating at such low metallicities. One plausible explanation is that this enhancement originates from material ejected at unusually high velocities in a neutron star merger event. We also explore the possibility that the neutron-capture elements were produced during the evolution and explosion of a rotating massive star. In addition, based on comparisons with yields from zero-metallicity faint supernova, we speculate that RAVE-J1830-4555 was formed from a gas cloud pre-enriched by both progenitor types. From analysis based on Gaia DR2 measurements, we show that this star has orbital properties similar to the Galactic metal-weak thick-disk stellar population.

Identifier
DOI http://doi.org/10.26093/cds/vizier.18970078
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/ApJ/897/78
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/897/78
Related Identifier https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/897/78
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/ApJ/897/78
Provenance
Creator Placco V.M.; Santucci R.M.; Yuan Z.; Mardini M.K.; Holmbeck E.M.; Wang X.,Surman R.; Hansen T.T.; Roederer I.U.; Beers T.C.; Choplin A.; Ji A.P.,Ezzeddine R.; Frebel A.; Sakari C.M.; Whitten D.D.; Zepeda J.
Publisher CDS
Publication Year 2021
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