... stars

Based on observations collected at the European Southern Observatory (La Silla, Chile).

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...1,

Research Associate FNRS (Belgium).

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...é^1,

Research Fellow FNRS (Belgium).

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... resolved

Note that we also determined the heliocentric radial velocities of the sharp interstellar features: we obtain RVs of  $-16.6 \pm 15.0$, $-7.8 \pm 10.5$ and $-10.2 \pm 14.0$ km s^-1 for the He  I $\lambda$ 3889, Ca  II $\lambda$ 3934 and Ca  II $\lambda$ 3968 lines. The $1\sigma$ dispersions listed here provide some rough indication of the accuracy of our wavelength calibration.

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... -7.7 mag

Moffat et al. (1994) derived an average $M_{\rm V}$ of -7.7 for the three H-rich WN stars in NGC 3603, whilst Crowther & Dessart (1998) re-evaluated their distance and reddening and obtained an average of -6.9 mag.

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