理论恒星库已越来越多地被用来克服经验库的局限性，例如通过探索大气参数空间没有很好地表示在后者。本工作提出了一个新的理论库，涵盖3000 $\leq$ Teff $\leq$ 25000\，K，-0.5 $\leq$ log g $\leq$ 5.5，和12种化学混合物，覆盖0.0017 $\leq$ Z $\leq$ 0. 049的比例太阳能和$α$增强的组合物。该库通过提供以下内容补充了以前的库：（i）不透明度分布函数、模型大气、统计表面通量和高分辨率光谱的均匀计算;（ii）具有通过预测线的效果校正的连续斜率的高分辨率光谱;（iii）对于每种定标的太阳能铁丰度，两族$α$增强的混合物，以允许在“固定铁”和“固定Z”情况下研究$α$增强。与观测到的光谱进行了比较，并确认合成光谱再现良好的观察，虽然有波长区域，仍应改进。将模型库的大气参数标度与一个广泛使用的经验库的大气参数标度进行了比较，发现两者之间没有系统的差异，这对于在光谱巡天中使用合成光谱来推导恒星大气参数的方法来说是特别可靠的。
英文摘要：
Theoretical stellar libraries have been increasingly used to overcome limitations of empirical libraries, e.g. by exploring atmospheric parameter spaces not well represented in the latter. This work presents a new theoretical library which covers 3000 $\leq$ Teff $\leq$ 25000\,K, -0.5 $\leq$ log g $\leq$ 5.5, and 12 chemical mixtures covering 0.0017 $\leq$ Z $\leq$ 0.049 at both scaled-solar and $α$-enhanced compositions. This library complements previous ones by providing: (i) homogeneous computations of opacity distribution functions, models atmospheres, statistical surface fluxes and high resolution spectra; (ii) high resolution spectra with continua slopes corrected by the effect of predicted lines, and; (iii) two families of $α$-enhanced mixtures for each scaled-solar iron abundance, to allow studies of the $α$-enhancement both at `fixed iron' and `fixed Z' cases. Comparisons to observed spectra were performed and confirm that the synthetic spectra reproduce well the observations, although there are wavelength regions which should be still improved. The atmospheric parameter scale of the model library was compared to one derived from a widely used empirical library, and no systematic difference between the scales was found. This is particularly reassuring for methods which use synthetic spectra for deriving atmospheric parameters of stars in spectroscopic surveys.
FORS2/VLT survey of Milky Way globular clusters I. Description of the method for derivation of metal abundances in the optical and application to NGC 6528, NGC 6553, M 71, NGC 6558, NGC 6426 and Terzan 8
