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Abstract: With HST, colour-magnitude diagrams CMDs can be obtained for young starclusters well beyond the Local Group. Such data can help constrain cluster agesand metallicities, and also provide a reference against which intermediate- andhigh mass stellar models can be compared. Here, CMDs are presented for twomassive >10^5 Msun clusters and compared with Padua and Geneva isochrones.The problem of the ratio of blue to red supergiants is also addressed.

Autor: S. S. Larsen Astronomical Institute, Utrecht University


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