Ages of globular clusters: Breaking the age-distance degeneracy with the luminosity function

被引:9
作者
Padoan, P [1 ]
Jimenez, R [1 ]
机构
[1] ROYAL OBSERV,EDINBURGH EH9 3HJ,MIDLOTHIAN,SCOTLAND
关键词
globular clusters; general; stars; evolution; luminosity function; mass function;
D O I
10.1086/303582
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We extend our previous method to determine globular cluster (GC) ages using the luminosity function (Jimenez & Padoan). This method provides at the same time independent determinations of distance and age of a GC, by simply counting the number of stars found inside specified luminosity bins. The main uncertainties in other traditional methods for determining GC ages are absent (e.g., mixing length, color-T-eff calibration, morphology of the color-magnitude diagram). If GC stellar counts with statistical errors not larger than 3% are available, the age can be determined with an uncertainty of about 0.5 Gyr, and the distance modulus with an uncertainty of about 0.06 mag.
引用
收藏
页码:580 / 583
页数:4
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