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Abundances from a large spectroscopic survey in ω Centauri

Published online by Cambridge University Press:  08 November 2005

A. Kayser ,
M. Hilker ,
T. Richtler  and
P. Willemsen
A. Kayser
Affiliation:
Astronomisches Institut der Universität Basel, Venusstrasse 7, 4102 Binningen, Switzerland
M. Hilker
Affiliation:
Sternwarte der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
T. Richtler
Affiliation:
Universidad de Concepción, Departamento de Física, Casilla 106-C, Concepción, Chile
P. Willemsen
Affiliation:
Sternwarte der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
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ω Centauri, the largest globular cluster of our Milky Way, is an outstanding object in many aspects. Studies on the red giant branch (RGB) revealed a large spread in iron abundance, which ranges from [Fe/H]∼-2.0 to -0.4 dex and the existence of multiple sub-populations that do not only differ in their element abundances but also in their spatial and kinematic distributions (e.g. Norris et al. 1997). Furthermore more recent photometric studies suggested the existence of an age spread between these subpopulations (e.g. Hilker & Richtler 2000).

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C198: Near-Field Cosmology with Dwarf Elliptical Galaxies , March 2005 , pp. 418 - 419
Copyright
© 2005 International Astronomical Union