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We perform integrated spectroscopy of 24 Galactic globular clusters. Spectraare observed from one core radius for each cluster with a high wavelengthresolution of ~2.0 A FWHM. In combination with two existing data sets fromPuzia et al. (2002) and Schiavon et al. (2005), we construct a large databaseof Lick spectral indices for a total of 53 Galactic globular clusters with awide range of metallicities, -2.4 < [Fe/H] < 0.1, and various horizontal-branchmorphologies. The empirical index-to-metallicity conversion relationships areprovided for the 20 Lick indices for the use of deriving metallicities forremote, unresolved stellar systems.

A new catalog of homogenised absorption line indices for Milky Way globular clusters from high-resolution integrated spectroscopy