Chemical compositions of Galactic bulge stars Virtual Observatory Resource

Authors
  1. Duong L.
  2. Asplund M.
  3. Nataf D.M.
  4. Freeman K.C.
  5. Ness M.
  6. Published by
    CDS
Abstract

This work explores the detailed chemistry of the Milky Way bulge using the HERMES spectrograph on the Anglo-Australian Telescope. Here, we present the abundance ratios of 13 elements for 832 red giant branch and clump stars along the minor bulge axis at latitudes b=-10{deg},-7.5{deg}, and -5{deg}. Our results show that none of the abundance ratios vary significantly with latitude. We also observe disc-like [Na/Fe] abundance ratios, which indicate that the bulge does not contain helium-enhanced populations as observed in some globular clusters. Helium enhancement is therefore not the likely explanation for the double red-clump observed in the bulge. We confirm that bulge stars mostly follow abundance trends observed in the disc. However, this similarity is not confirmed across all elements and metallicity regimes. The more metal-poor bulge population at [Fe/H]~<-0.8 is enhanced in the elements associated with core collapse supernovae (SNeII). In addition, the [La/Eu] abundance ratio suggests higher r-process contribution, and likely higher star formation in the bulge compared to the disc. This highlights the complex evolution in the bulge, which should be investigated further, both in terms of modelling; and with additional observations of the inner Galaxy.

Keywords
  1. Chemical abundances
  2. Milky Way Galaxy
  3. Spectroscopy
  4. Optical astronomy
  5. Infrared astronomy
Bibliographic source Bibcode
2019MNRAS.486.5349D
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/486/5349
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/486/5349

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http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/486/5349
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/486/5349
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/486/5349
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History

2022-12-15T12:41:08Z
Resource record created
2022-12-15T12:41:08Z
Created
2023-02-24T07:53:28Z
Updated

Contact

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