晕族
- 网络halo population
晕族-
这种方法最初是利用元素对Th/Nd来确定G矮星的年龄，近年来开始利用元素对Th/Eu和U/Th来确定晕族场星和球状星团内恒星的年龄。
At first , this age-dating approach was used to estimate the age of G-dwarf stars with Th / Nd chronometry . Recently , it has been used to evaluate the age of halo field stars and globular cluster stars with the Th / Eu and U / Th chronometers .