Spectroscopic validation of RAVE metal-poor stars Virtual Observatory Resource

Authors
  1. Placco V.M.
  2. Beers T.C.
  3. Santucci R.M.
  4. Chaname J.
  5. Sepulveda M.P.,Coronado J.
  6. Points S.D.
  7. Kaleida C.C.
  8. Rossi S.
  9. Kordopatis G.
  10. Lee Y.S.,Matijevic G.
  11. Frebel A.
  12. Hansen T.T.
  13. Holmbeck E.M.
  14. Rasmussen K.C.,Roederer I.U.
  15. Sakari C.M.
  16. Whitten D.D.
  17. Published by
    CDS
Abstract

We present results from a medium-resolution (R~2000) spectroscopic follow-up campaign of 1694 bright (V<13.5), very metal-poor star candidates from the RAdial Velocity Experiment (RAVE). Initial selection of the low-metallicity targets was based on the stellar parameters published in RAVE Data Releases 4 (Cat. III/272) and 5 (Cat. III/279). Follow up was accomplished with the Gemini-N and Gemini-S, the ESO/NTT, the KPNO/Mayall, and the SOAR telescopes. The wavelength coverage for most of the observed spectra allows for the determination of carbon and {alpha}-element abundances, which are crucial for considering the nature and frequency of the carbon-enhanced metal-poor (CEMP) stars in this sample. We find that 88% of the observed stars have [Fe/H]=< -1.0, 61% have [Fe/H]=< -2.0, and 3% have [Fe/H]=< -3.0 (with four stars at [Fe/H]=< -3.5). There are 306 CEMP star candidates in this sample, and we identify 169 CEMP Group I, 131 CEMP Group II, and 6 CEMP Group III stars from the A(C) versus [Fe/H] diagram. Inspection of the [{alpha}/C] abundance ratios reveals that five of the CEMP Group II stars can be classified as "mono-enriched second-generation" stars. Gaia DR1 matches were found for 734 stars, and we show that transverse velocities can be used as a confirmatory selection criteria for low-metallicity candidates. Selected stars from our validated list are being followed-up with high-resolution spectroscopy to reveal their full chemical-abundance patterns for further studies.

Keywords
  1. halo-stars
  2. carbon-stars
  3. chemically-peculiar-stars
  4. spectroscopy
  5. radial-velocity
  6. effective-temperature
  7. chemical-abundances
  8. proper-motions
  9. visible-astronomy
  10. trigonometric-parallax
Bibliographic source Bibcode
2018AJ....155..256P
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/155/256
IVOA Identifier IVOID
ivo://CDS.VizieR/J/AJ/155/256
Document Object Identifer DOI
doi:10.26093/cds/vizier.51550256

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History

2019-01-15T08:27:22Z
Resource record created
2019-01-15T08:27:22Z
Created
2020-01-31T11:48:30Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr