Old open clusters: UBGVRI photometry of NGC 2506

被引：35
作者：
Marconi, G
Hamilton, D
Tosi, M
Bragaglia, A
机构：
[1] MAX PLANCK INST ASTRON,HEIDELBERG,GERMANY
[2] OSSERVATORIO ASTRON BOLOGNA,BOLOGNA,ITALY
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1997年 / 291卷 / 04期
关键词：
Hertzsprung-Russell (HR) diagram; open clusters and associations; general; individual; NGC; 2506;
D O I：
10.1093/mnras/291.4.763
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
UBGVRI photometry for the open cluster NGC 2506 is presented. From comparison of the observed colour-magnitude diagrams with simulations based on stellar evolutionary models we derive in a self-consistent way the reddening, distance and age of the cluster: E (B - V) = 0-0.07, (m - M)(0) = 12.6 +/- 0.1, tau = 1.5-2.2 Gyr. The cluster shows a well-defined secondary sequence, suggesting that binary systems constitute greater than or similar to 20 per cent of the cluster members visible in the colour-magnitude diagram.
引用
收藏
页码：763 / 772
页数：10
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