CASH project II. 14 extremely metal-poor stars Virtual Observatory Resource

Authors
  1. Hollek J.K.
  2. Frebel A.
  3. Roederer I.U.
  4. Sneden C.
  5. Shetrone M.
  6. Beers T.C.,Kang S.-J.
  7. Thom C.
  8. Published by
    CDS
Abstract

We present a comprehensive abundance analysis of 20 elements for 16 new low-metallicity stars from the Chemical Abundances of Stars in the Halo (CASH) project. The abundances have been derived from both Hobby-Eberly Telescope High Resolution Spectrograph snapshot spectra (R~15000) and corresponding high-resolution (R~35000) Magellan Inamori Kyocera Echelle spectra. The stars span a metallicity range from [Fe/H] from -2.9 to -3.9, including four new stars with [Fe/H]<-3.7. We find four stars to be carbon-enhanced metal-poor (CEMP) stars, confirming the trend of increasing [C/Fe] abundance ratios with decreasing metallicity. Two of these objects can be classified as CEMP-no stars, adding to the growing number of these objects at [Fe/H]<-3. We also find four neutron-capture-enhanced stars in the sample, one of which has [Eu/Fe] of 0.8 with clear r-process signatures. These pilot sample stars are the most metal-poor ([Fe/H]<~-3.0) of the brightest stars included in CASH and are used to calibrate a newly developed, automated stellar parameter and abundance determination pipeline. This code will be used for the entire ~500 star CASH snapshot sample. We find that the pipeline results are statistically identical for snapshot spectra when compared to a traditional, manual analysis from a high-resolution spectrum.

Keywords
  1. line-intensities
  2. chemical-abundances
  3. halo-stars
  4. chemically-peculiar-stars
Bibliographic source Bibcode
2011ApJ...742...54H
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/742/54
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/742/54
Document Object Identifer DOI
doi:10.26093/cds/vizier.17420054

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History

2013-06-03T20:12:21Z
Resource record created
2013-06-03T20:12:21Z
Created
2017-09-20T05:13:59Z
Updated

Contact

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