Extremely metal-poor star candidates abundances Virtual Observatory Resource

Authors
  1. Lai D.K.
  2. Bolte M.
  3. Johnson J.A.
  4. Lucatello S.
  5. Published by
    CDS
Abstract

We present chemical abundances for 110 stars identified in objective-prism surveys as candidates for being very metal-poor. The abundances are derived from high-S/N, intermediate-resolution spectra obtained with the Keck Observatory Echellette Spectrograph and Imager (ESI). An additional 25 stars with well-determined abundances ranging from [Fe/H]=-1.5 to -3.2 were observed and the results used to help calibrate our analysis and determine the accuracy of our abundance determinations. Abundances for the program stars were measured for Fe, Mg, Ca, Ti, Cr, and Ba with an accuracy of approximately 0.3dex. Fifty-three of the stars in our sample have [Fe/H]<=-2, 22 have [Fe/H]<=-2.5, and 13 have [Fe/H]<=-2.9. Surprisingly, approximately one-third of the sample is relatively metal-rich, with [Fe/H]>-1.5. In addition to identifying a number of extremely metal-poor stars, this study also shows that moderate-resolution spectra obtained with the Keck ESI yield relatively accurate abundances for stars as faint as V=14 with modest exposure time (~20 minutes). This capability will prove useful if the so-far elusive stars at [Fe/H]<-4 turn out to be mostly fainter than V=15.

Keywords
  1. population-ii-stars
  2. chemically-peculiar-stars
Bibliographic source Bibcode
2004AJ....128.2402L
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/128/2402
IVOA Identifier IVOID
ivo://CDS.VizieR/J/AJ/128/2402
Document Object Identifer DOI
doi:10.26093/cds/vizier.51282402

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/128/2402
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/128/2402
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/128/2402
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/128/2402/stars?
https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/128/2402/stars?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/128/2402/stars?

History

2007-04-10T21:21:47Z
Resource record created
2007-04-10T21:21:47Z
Created
2017-10-02T19:28:35Z
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