Abstract
The authors report the measurements of the He I λ 10830 Å line strengths with HST/NICMOS for the three WR stars HD 97950-A1, B, C in NGC 3603. They combine these new observations with H I/He II line strengths from published HST/FOS spectra to derive the stellar parameters of the WR stars. Compared to previous results our analyses yield similar parameters for HD 97950-A1 and C but a considerably hotter temperature and higher luminosity for HD 97950-B. The authors confirm that all three WR stars contain a large amount of hydrogen, possibly close to a solar H/He ratio, which implies that these WR stars are still in an early phase of their evolution. It appears that the three WR stars in NGC 3603 are the most massive stars that were formed in the cluster.
