An age difference of two billion years between a metal-rich and a metal-poor globular cluster

B. M. S. Hansen (), J. S. Kalirai, J. Anderson, A. Dotter, H. B. Richer, R. M. Rich, M. M. Shara, G. G. Fahlman, J. R. Hurley, I. R. King, D. Reitzel and P. B. Stetson
Additional contact information
B. M. S. Hansen: University of California Los Angeles
J. S. Kalirai: Space Telescope Science Institute, 3700 San Martin Drive
J. Anderson: Space Telescope Science Institute, 3700 San Martin Drive
A. Dotter: Research School of Astronomy and Astrophysics, Australian National University, Weston Creek, Australian Capital Territory 2611, Australia
H. B. Richer: University of British Columbia, Vancouver, British Columbia, V6T 1Z1, Canada
R. M. Rich: University of California Los Angeles
M. M. Shara: American Museum of Natural History, Central Park West and 79th Street, New York, New York 10024, USA
G. G. Fahlman: NRC Herzberg, Victoria, British Columbia V9E 2E7, Canada
J. R. Hurley: Center for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
I. R. King: Box 351580, University of Washington
D. Reitzel: University of California Los Angeles
P. B. Stetson: NRC Herzberg, Victoria, British Columbia V9E 2E7, Canada

Nature, 2013, vol. 500, issue 7460, 51-53

Abstract: An absolute age of about ten billion years is determined for the globular cluster 47 Tucanae, which is about two billion years younger than the cluster NGC 6397 is thought to be, suggesting that metal-rich clusters like 47 Tucanae formed later than metal-poor clusters like NGC 6397.

Date: 2013
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DOI: 10.1038/nature12334

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