Diameters of open star clusters

被引：25
|
作者：
Van den Bergh, S [1 ]
机构：
[1] Natl Res Council Canada, Herzberg Inst Astrophys, Dominion Astrophys Observ, Victoria, BC V9E 2E7, Canada
来源：
ASTRONOMICAL JOURNAL | 2006年 / 131卷 / 03期
关键词：
open clusters and associations : general;
D O I：
10.1086/499532
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The present paper presents a tabulation of data on all 600 Galactic open clusters for which it is currently possible to calculate linear diameters. As expected, the youngest `` clusters,'' with ages < 15 Myr, contain a significant ( >= 20%) admixture of associations. Among intermediate- age clusters, with ages in the range 15 Myr to 1.5 Gyr, the median cluster diameter is found to increase with age. Small, compact clusters are rare among objects with ages > 1.5 Gyr. Open clusters with ages > 1 Gyr appear to form what might be termed a `` cluster thick disk,'' part of which consists of objects that were probably captured gravitationally by the main body of the Galaxy.
引用
收藏
页码：1559 / 1564
页数：6
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