Spectroscopy of extremely metal-poor stars Virtual Observatory Resource

Authors
  1. Marino A.F.
  2. Da Costa G.S.
  3. Casey A.R.
  4. Asplund M.
  5. Bessell M.S.,Frebel A.
  6. Keller S.C.
  7. Lind K.
  8. Mackey A.D.
  9. Murphy S.J.
  10. Nordlander T.,Norris J.E.
  11. Schmidt B.P.
  12. Yong D.
  13. Published by
    CDS
Abstract

We present results from the analysis of high-resolution spectra obtained with the Keck HIRES spectrograph for a sample of 17 candidate extremely metal-poor (EMP) stars originally selected from commissioning data obtained with the SkyMapper telescope. Fourteen of the stars have not been observed previously at high dispersion. Three have [Fe/H]=<-3.0, while the remainder, with two more metal-rich exceptions, have -3.0=<[Fe/H]=<-2.0dex. Apart from Fe, we also derive abundances for the elements C, N, Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Mn, Co, Ni, and Zn, and for n-capture elements Sr, Ba, and Eu. None of the current sample of stars is found to be carbon-rich. In general, our chemical abundances follow previous trends found in the literature, although we note that two of the most metal-poor stars show very low [Ba/Fe] (~-1.7) coupled with low [Sr/Ba] (~-0.3). Such stars are relatively rare in the Galactic halo. One further star, and possibly two others, meet the criteria for classification as a r-I star. This study, together with that of Jacobson et al. (2015ApJ...807..171J, Cat. J/ApJ/807/171), completes the outcomes of the SkyMapper commissioning data survey for EMP stars.

Keywords
  1. chemical-abundances
  2. population-ii-stars
  3. chemically-peculiar-stars
  4. spectroscopy
  5. visible-astronomy
Bibliographic source Bibcode
2019MNRAS.485.5153M
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/485/5153
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/485/5153
Document Object Identifer DOI
doi:10.26093/cds/vizier.74855153

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/485/5153
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/485/5153
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/485/5153
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).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/485/5153/table1?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/485/5153/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/485/5153/table1?

History

2022-12-01T14:03:29Z
Resource record created
2022-12-01T14:03:29Z
Created
2024-08-19T20:17:49Z
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