Metal-poor stars observed with SALT/HRS. II. Virtual Observatory Resource

Authors
  1. Zepeda J.
  2. Rasmussen K.C.
  3. Beers T.C.
  4. Placco V.M.
  5. Huang Y.
  6. Depagne E.
  7. Published by
    CDS
Abstract

We present results from high-resolution (R~40000) spectroscopic observations of over 200 metal-poor stars, mostly selected from the RAVE survey, using the Southern African Large Telescope. We were able to derive stellar parameters for a total of 108 stars; an additional sample of 50 stars from this same effort was previously reported on by Rasmussen+ 2020ApJ...905...20R (Cat. J/ApJ/905/20). Among our newly reported observations, we identify 84 very metal-poor (VMP; [Fe/H]{<}-2.0, 53 newly identified) stars and three extremely metal-poor (EMP; [Fe/H]{<}-3.0, one newly identified) stars. The elemental abundances were measured for carbon, as well as several other {alpha}-elements (Mg, Ca, Sc, and Ti), iron-peak elements (Mn, Co, Ni, and Zn), and neutron-capture elements (Sr, Ba, and Eu). Based on these measurements, the stars are classified by their carbon and neutron-capture abundances into carbon-enhanced metal-poor (CEMP; [C/Fe]{>}+0.70), CEMP subclasses, and by the level of their r-process abundances. A total of 17 are classified as CEMP stars. There are 11 CEMP-r stars (eight newly identified), one CEMP-s star (newly identified), two possible CEMP-i stars (one newly identified), and three CEMP-no stars (all newly identified) in this work. We found 11 stars (eight newly identified) that are strongly enhanced in r-process elements (r-II; [Eu/Fe]{>}+0.70), 38 stars (31 newly identified) that are moderately enhanced in r-process elements (r-I; +0.30<[Eu/Fe]<=+0.70), and one newly identified limited-r star.

Keywords
  1. radial-velocity
  2. chemical-abundances
  3. effective-temperature
  4. chemically-peculiar-stars
  5. visible-astronomy
  6. spectroscopy
Bibliographic source Bibcode
2022ApJ...927...13Z
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History

2023-12-22T09:55:19Z
Resource record created
2023-12-22T09:15:32Z
Updated
2023-12-22T09:55:19Z
Created

Contact

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