Abundances for stars in Plaut's window Virtual Observatory Resource

Authors
  1. Johnson C.I.
  2. Rich R.M.
  3. Kobayashi C.
  4. Fulbright J.P.
  5. Published by
    CDS
Abstract

We report chemical abundances of Na, Al, Zr, La, Nd, and Eu for 39 red giant branch (RGB) stars and 23 potential inner disk red clump stars located in Plaut's low-extinction window. We also measure lithium for a super Li-rich RGB star. The abundances were determined by spectrum synthesis of high-resolution (R{approx}25000), high signal-to-noise (S/N ~ 50-100/pixel) spectra obtained with the Blanco 4m telescope and Hydra multifiber spectrograph. For the bulge RGB stars, we find a general increase in the [Na/Fe] and [Na/Al] ratios with increasing metallicity, and a similar decrease in [La/Fe] and [Nd/Fe]. Additionally, the [Al/Fe] and [Eu/Fe] abundance trends almost identically follow those of the {alpha}-elements, and the [Zr/Fe] ratios exhibit relatively little change with [Fe/H]. The consistently low [La/Eu] ratios of the RGB stars indicate that at least a majority of bulge stars formed rapidly (<~1Gyr) and before the main s-process could become a significant pollution source. In contrast, we find that the potential inner disk clump stars exhibit abundance patterns more similar to those of the thin and thick disks. Comparisons between the abundance trends at different bulge locations suggest that the inner and outer bulges formed on similar timescales. However, we find evidence of some abundance differences between the most metal-poor and metal-rich stars in various bulge fields. The data also indicate that the halo may have had a more significant impact on the outer bulge initial composition than the inner bulge composition. The [Na/Fe], and to a lesser extent [La/Fe], abundances further indicate that the metal-poor bulge, at least at ~1 kpc from the Galactic center, and thick disk may not share an identical chemistry.

Keywords
  1. chemical-abundances
  2. giant-stars
Bibliographic source Bibcode
2012ApJ...749..175J
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/749/175
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/749/175
Document Object Identifer DOI
doi:10.26093/cds/vizier.17490175

Access

Web browser access HTML
https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/749/175
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/749/175
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/749/175
IVOA Table Access TAP
https://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/ApJ/749/175/table2?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/749/175/table2?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/749/175/table2?

History

2014-01-15T10:16:56Z
Resource record created
2014-01-15T10:16:56Z
Created
2017-12-12T14:44:22Z
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