The age of the universe

被引：42
|
作者：
Chaboyer, B [1 ]
机构：
[1] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
来源：
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS | 1998年 / 307卷 / 1-4期
基金：
美国国家航空航天局;
关键词：
globular clusters; cosmology; stellar structure; white dwarfs;
D O I：
10.1016/S0370-1573(98)00054-4
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A minimum age of the universe can be estimated directly by determining the age of the oldest objects in our Galaxy. These objects are the metal-poor stars in the halo of the Milky Way. Recent work on nucleochronology finds that the oldest stars are 15.2 +/- 3.7 Gyr old. White dwarf cooling curves have found a minimum age for the oldest stars of 8 Gyr. Currently, the best estimate for the age of the oldest stars is based upon the absolute magnitude of the main sequence turn-off in globular clusters. The oldest globular clusters are 11.5 +/- 1.3 Gyr, implying a minimum age of the universe of t(universe) greater than or equal to 9.5 Gyr (95% confidence level). (C) 1998 Elsevier Science B.V. All rights reserved.
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页码：23 / 30
页数：8
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