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Spectrum Scans of Globular Clusters in M87

Published online by Cambridge University Press:  14 August 2015

David A. Hanes
Affiliation:
Institute of Astronomy, University of Cambridge, Cambridge, U.K.
Jean F. Brodie
Affiliation:
Institute of Astronomy, University of Cambridge, Cambridge, U.K.

Abstract

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Spectrum scans at 10 A resolution have been obtained for four likely clusters in the field of the giant elliptical galaxy NGC 4486 (M87), using the IPCS at the 4-metre Anglo-Australian Telescope. A wavelength range of 3500–7000 A was covered, with the objects having brightnesses from V=19.5 to V=19.8 mag. Preliminary analysis suggests that one of these objects is comparable to the metal-richest known Galactic globular clusters, while the other three seem to be even more metal-rich. Alternative explanations, such as gross differences in the stellar mix within the M87 clusters compared to those in our own Galaxy, may account for the observed spectroscopic differences; quantitative analysis is just beginning.

Type
August 30 Globular Clusters
Copyright
Copyright © Reidel 1980