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16 - Stellar abundances of early-type galaxies

Published online by Cambridge University Press:  02 December 2009

S. C. Trager
Affiliation:
Kapteyn Astronomical Institute, Rijksuniversiteit Groningen, Postbus 800, NL-9700 AV Groningen, the Netherlands
Garik Israelian
Affiliation:
Instituto de Astrofísica de Canarias, Tenerife
Georges Meynet
Affiliation:
Geneva Observatory
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Summary

It is currently impossible to determine the abundances of the stellar populations star by star in dense stellar systems more distant than a few megaparsecs. Therefore, methods to analyse the composite light of stellar systems are required. I review recent progress in determining the abundances and abundance ratios of early-type galaxies. I begin with ‘direct’ abundance measurements: colour–magnitude diagrams of stars and planetary nebulae in nearby early-type galaxies. I then give an overview of ‘indirect’ abundance measurements: inferences from stellar-population models, with an emphasis on cross-checks with ‘direct’ methods. I consider the variations of early-type galaxy abundances as a function of mass, age and environment in the local Universe. I conclude with a list of continuing difficulties in the modelling that complicate the interpretation of integrated spectra and I look ahead to new methods and new observations.

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Publisher: Cambridge University Press
Print publication year: 2008

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