Abstract
Based on the method proposed by Kong et al. and on the multi-color spectrophotometry by Ma et al., we estimate the metallicities of 16 old star clusters in the nearby spiral galaxy M33, ten of which are halo globular clusters. These old clusters are all metal poor, the range of metallicity ((Fe/H)) is from 0.14 to 2.12. In general, our results are consistent with those derived by other methods, such as integrated spectra and photometry, and our study confirms the reliability of the method of Kong et al. Globular clusters are thought to be among the oldest radiant objects in the Universe. The studies of these systems have played a key role in the development of our understanding of the Universe, including the fundamental question of the age of the Universe. The globular clusters of Milky Way can be used to probe the way in which our Galaxy formed. Studies of similar clusters in other galaxies can also provide us the properties of those galaxies in the early period
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