摘要
We apply the method of principal component analysis to a sample of simple stellar populations to select some age sensitive spectral indices. Besides the well-known age sensitive index Hβ, we also find some new age sensitive indices, G4300 and Fe4383, C_(2)4668, and Mgb. In addition, we find that these spectral indices sensitive to age depend on the metallicity of stellar population, Hβ and G4300 are more suitable to determine the age of loy metallicity stellar population, while C_(2)4668 and Mgb are more suitable to the high metallicity stellar population.
作者
Kong Xu
CHENG Fu-Zhen
孔旭;程福臻(Center for Astrophysics,University of Science and Technology of China,Hefei 230026;National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012;CAS-Peking University Joint Beijing Astrophysics Center,Beijing 100871)
基金
Supported by the National Natural Science Foundation of China under Grant No.19473010
the National Pandeng Project,and the Key Project of Chinese Academy of Sciences(KJ951-A1-302).
