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

被引：0
|
作者：
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
P. B. Stetson
机构：
[1] University of California Los Angeles,Division of Astronomy
[2] Space Telescope Science Institute,Department of Physics and Astronomy
[3] 3700 San Martin Drive,Department of Astrophysics
[4] Center for Astrophysical Sciences,Department of Astronomy
[5] Johns Hopkins University,undefined
[6] Research School of Astronomy and Astrophysics,undefined
[7] Australian National University,undefined
[8] Weston Creek,undefined
[9] Australian Capital Territory 2611,undefined
[10] Australia,undefined
[11] University of British Columbia,undefined
[12] Vancouver,undefined
[13] British Columbia,undefined
[14] V6T 1Z1,undefined
[15] Canada,undefined
[16] American Museum of Natural History,undefined
[17] Central Park West and 79th Street,undefined
[18] New York,undefined
[19] New York 10024,undefined
[20] USA,undefined
[21] NRC Herzberg,undefined
[22] Victoria,undefined
[23] British Columbia V9E 2E7,undefined
[24] Canada,undefined
[25] Center for Astrophysics and Supercomputing,undefined
[26] Swinburne University of Technology,undefined
[27] Hawthorn,undefined
[28] Victoria 3122,undefined
[29] Australia,undefined
[30] Box 351580,undefined
[31] University of Washington,undefined
来源：
Nature | 2013年 / 500卷
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摘要：
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.
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页码：51 / 53
页数：2
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