Chemical abundances in a metal-poor RGB star Virtual Observatory Resource

Authors
  1. Johnson C.I.
  2. McWilliam A.
  3. Rich R.M.
  4. Published by
    CDS
Abstract

We present chemical abundances for 27 elements ranging from oxygen to erbium in the metal-poor ([Fe/H]=-1.67) bulge red giant branch star 2MASS 18174532-3353235. The results are based on equivalent width and spectrum synthesis analyses of a high-resolution (R~30000) spectrum obtained with the Magellan-MIKE spectrograph. While the light (Z<~30) element abundance patterns match those of similar metallicity bulge and halo stars, the strongly enhanced heavy element abundances are more similar to "r-II" halo stars (e.g., CS 22892-052) typically found at [Fe/H]<~-2.5. We find that the heaviest elements (Z>=56) closely follow the scaled-solar r-process abundance pattern. We do not find evidence supporting significant s-process contributions; however, the intermediate mass elements (e.g., Y and Zr) appear to have been produced through a different process than the heaviest elements. The light and heavy element abundance patterns of 2MASS 18174532-3353235 are in good agreement with the more metal-poor r-process enhanced stars CS 22892-052 and BD +17{deg}3248. 2MASS 18174532-3353235 also shares many chemical characteristics with the similar metallicity but comparatively {alpha}-poor Ursa Minor dwarf galaxy giant COS 82. Interestingly, the Mo and Ru abundances of 2MASS 18174532-3353235 are also strongly enhanced and follow a similar trend recently found to be common in moderately metal-poor main-sequence turn-off halo stars.

Keywords
  1. chemical-abundances
  2. giant-stars
  3. chemically-peculiar-stars
Bibliographic source Bibcode
2013ApJ...775L..27J
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/775/L27
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/775/L27
Document Object Identifer DOI
doi:10.26093/cds/vizier.17759027

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History

2015-04-20T15:18:09Z
Resource record created
2015-04-20T15:18:09Z
Created
2015-05-06T15:20:56Z
Updated

Contact

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