用于恒星星族研究的FGK恒星光谱指数的FEROS-Lick/SDSS观测数据库
The FEROS--Lick/SDSS observational database of spectral indices of FGK stars for stellar population studies
摘要：
我们提出FEROS-Lick/SDSS，一个经验数据库的FGK恒星的Lick/SDSS光谱指数用于人口综合项目，区分不同的恒星星族内的综合光的星系和球状星团。从大约2500 FEROS恒星光谱获得的ESO科学档案设施，我们计算线强度指数为1085非超巨星大气参数估计从AMBRE项目。两个样本的312 { \it矮星}和83 { \it亚巨星}与太阳的化学成分和没有显着的$α$ -元素丰度增强被用来比较其观测指数与预测的利克/SDSS库的合成指数。总的来说，合成的数据库很好地再现了观测指数随温度变化的行为，但是在低温（$T_{\rm eff}$ $\lesssim $ 5000\，K）矮星的情况下，低温次巨星的数量不足以得出任何结论。几种可能的原因的分歧进行了讨论，并提出了有前途的理论改进。
英文摘要：
We present FEROS--Lick/SDSS, an empirical database of Lick/SDSS spectral indices of FGK stars to be used in population synthesis projects for discriminating different stellar populations within the integrated light of galaxies and globular clusters. From about 2500 FEROS stellar spectra obtained from the ESO Science Archive Facility we computed line--strength indices for 1085 non--supergiant stars with atmospheric parameter estimates from the AMBRE project. Two samples of 312 {\it dwarfs} and of 83 {\it subgiants} with solar chemical composition and no significant $α$--element abundance enhancement are used to compare their observational indices with the predictions of the Lick/SDSS library of synthetic indices. In general, the synthetic library reproduces very well the behaviour of observational indices as a function of temperature, but in the case of low temperature ($T_{\rm eff}$ $\lesssim $5000\,K) dwarfs; low temperature subgiants are not numerous enough to derive any conclusion. Several possible causes of the disagreement are discussed and promising theoretical improvements are presented.
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