Abstract
We have studied high a low resolution IUE spectra of O and B stars in the LMC cluster NGC 2100, the SMC cluster NGC 330, and the young Galactic cluster NGC 6530. Temperatures and luminosities were determined. In the LMC and SMC clusters the most luminous stars are evolved stars on the “horizontal” supergiant branch, while in NGC 6530 the stars are all still on the main sequence.Extinction laws were determined. They confirm the known differences between LMC and galactic extinctions.No mass loss was detected for the evolved B stars in the LMC and SMC clusters, while the high luminosity stars in NGC 6530 show P Cygni profiles.
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