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r-process elements in globular clusters

Published online by Cambridge University Press:  23 December 2005

Kaori Otsuki ,
Satoshi Honda ,
Wako Aoki ,
Toshitaka Kajino ,
James W. Truran ,
Vikram Dwarkadas  and
Anibal Medina
Kaori Otsuki
Affiliation:
Department of Astronomy and Astrophysics, University of Chicago, 5640 S. Ellis Ave., IL 60637, USA email: otsuki@uchicago.edu
Satoshi Honda
Affiliation:
National Astronomical Observatory of Japan, Osawa 2-21, Mitaka, Tokyo 181-8588, Japan
Wako Aoki
Affiliation:
National Astronomical Observatory of Japan, Osawa 2-21, Mitaka, Tokyo 181-8588, Japan
Toshitaka Kajino
Affiliation:
National Astronomical Observatory of Japan, Osawa 2-21, Mitaka, Tokyo 181-8588, Japan
James W. Truran
Affiliation:
National Astronomical Observatory of Japan, Osawa 2-21, Mitaka, Tokyo 181-8588, Japan
Vikram Dwarkadas
Affiliation:
Department of Astronomy and Astrophysics, University of Chicago, 5640 S. Ellis Ave., IL 60637, USA email: otsuki@uchicago.edu
Anibal Medina
Affiliation:
Department of Astronomy and Astrophysics, University of Chicago, 5640 S. Ellis Ave., IL 60637, USA email: otsuki@uchicago.edu
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Abstract

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We have observed seven giants in the metal-poor globular cluster M15 using Subaru/HDS. We confirmed that there are significant star-to-star variations in the neutron-capture elemental abundances. This abundance variation means there were primordial chemical inhomogeneities in the proto-globular cluster cloud of M15. This result implies that there was insufficient time for complete mixing after r-process nucleosynthesis. It suggests that the main r-process occurs probably in supernovae which explode in later stages of globular cluster formation.

Keywords

Stars: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 403 - 404
Copyright
© 2005 International Astronomical Union