THE AGES OF THE GLOBULAR-CLUSTERS

被引：0
|
作者：
CARNEY, BW
机构：
来源：
IAU SYMPOSIA | 1992年 / 149期
关键词：
GLOBULAR CLUSTERS; RR LYRAE VARIABLES;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The recent results for the relation between M(V) and [Fe/H] for RR Lyrae variables and horizontal branch stars are reviewed: < M(V)(RR) > = 0.1 5[Fe/H] + 1.08. If [O/Fe] = 0.3, the oldest clusters' ages approach 20 Gyrs, and the the most metal-poor clusters are older than the most metal-rich by several Gyrs. If [O/Fe] is-proportional-to -0.4[Fe/H], the most metal-poor clusters have ages of about 14 Gyrs and the most metal-rich clusters are not much younger. In both cases, there are age spreads among the intermediate metallicity clusters of up to 6 Gyrs.
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页码：15 / 21
页数：7
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