Abundances of Local Group globular clusters Virtual Observatory Resource

Authors
  1. Larsen S.S.
  2. Eitner P.
  3. Magg E.
  4. Bergemann M.
  5. Moltzer C.A.S.
  6. Brodie J.P.,Romanowsky A.J.
  7. Strader J.
  8. Published by
    CDS
Abstract

We present detailed abundance measurements for 45 globular clusters (GCs) in galaxies in (and, in one case, beyond) the Local Group. The measurements are based on new high-resolution integrated-light spectra of GCs in NGC 185, NGC 205, M31, M33, and NGC 2403, combined with reanalysis of previous observations of GCs in the Fornax dSph, WLM, NGC 147, NGC 6822, and the Milky Way. The GCs cover the range -2.8<[Fe/H]<-0.1 and we determined abundances for Fe, Na, Mg, Si, Ca, Sc, Ti, Cr, Mn, Ni, Cu, Zn, Zr, Ba, and Eu. Corrections for non local thermodynamic equilibrium effects are included for Na, Mg, Ca, Ti, Mn, Fe, Ni, and Ba. For several of the galaxies, our measurements provide the first quantitative constraints on the detailed composition of their metal-poor stellar populations. Overall, the GCs in different galaxies exhibit remarkably uniform abundance patterns of the alpha-, iron-peak, and neutron-capture elements, with a dispersion of less than 0.1dex in [alpha/Fe] for the full sample. There is a hint that GCs in dwarf galaxies are slightly less alpha-enhanced (by about 0.04 dex on average) than those in larger galaxies. One GC in M33 (HM33-B) resembles the most metal-rich GCs in the Fornax dSph (Fornax 4) and NGC 6822 (SC7) by having alpha-element abundances closer to scaled-solar values, possibly hinting at an accretion origin. We find that the alpha-element abundances strongly correlate with those of Na, Sc, Ni, and Zn. Several GCs with [Fe/H]<-1.5 are deficient in Mg compared to other alpha-elements. We find no GCs with strongly enhanced r-process abundances as reported for metal-poor stars in some ultra-faint dwarfs and the Magellanic Clouds. The similarity of the abundance patterns for metal-poor GCs in different environments points to similar early enrichment histories and only allow for minor variations in the initial mass function.

Keywords
  1. globular-star-clusters
  2. chemical-abundances
  3. metallicity
  4. spectroscopy
  5. visible-astronomy
Bibliographic source Bibcode
2022A&A...660A..88L
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/660/A88
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/660/A88
Document Object Identifer DOI
doi:10.26093/cds/vizier.36600088

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History

2022-04-14T13:09:06Z
Resource record created
2022-04-14T13:09:06Z
Created
2023-11-07T10:18:54Z
Updated

Contact

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CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
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