Abstract
The star clusters of M33, after a slow start, have become a rich and revealing source of information on the galaxy’s history and its modes of star-formation. The discovery and analysis of clusters follows, to a large extent, the pattern of discovery of the rich cluster systems of the Magellanic Clouds (Westerlund 1997), but delayed in time by several decades. The first catalog of clusters was published by Hiltner (1960), who found 23 cluster candidates, based on examination of photographic plates taken with the Mt. Wilson 2.5 m telescope. Hiltner followed the discovery with photometry in the UBV system, from which he concluded that M33’s clusters were bluer and fainter than those of M31.
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Hodge, P. (2012). Clusters and Associations. In: The Spiral Galaxy M33. Astrophysics and Space Science Library, vol 379. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-2025-1_6
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