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Chemical composition of globular clusters in dwarf galaxies

Published online by Cambridge University Press:  11 March 2020

Søren S. Larsen Open the ORCID record for Søren S. Larsen [Opens in a new window]
Søren S. Larsen*
Affiliation:
Department of Astrophysics/IMAPP, Radboud University, Postbus 9010, NL-6500GL, Nijmegen, the Netherlands email: [email protected]
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Abstract

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This contribution gives an update on on-going efforts to characterise the detailed chemical abundances of Local Group globular clusters (GCs) from integrated-light spectroscopy. Observations of a sample of 20 GCs so far, located primarily within dwarf galaxies, show that at low metallicities the [α/Fe] ratios are generally indistinguishable from those in Milky Way GCs. However, the “knee” above which [α/Fe] decreases towards Solar-scaled values occurs at lower metallicities in the dwarfs, implying that GCs follow the same trends seen in field stars. Efforts are underway to establish NLTE corrections for integrated-light abundance measurements, and preliminary results for Mn are discussed.

Keywords

galaxies: star clusters: generalgalaxies: abundancestechniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S351: Star Clusters: From the Milky Way to the Early Universe , May 2019 , pp. 317 - 320
Copyright
© International Astronomical Union 2020

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