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Table 5

Coefficients obtained by a χ2-fit of Eq. (11) to the stellar parameters of the complete sample of 153 WN stars, and of the sub-samples of the hydrogen-free (56 stars) and the hydrogen-rich objects (14 stars), respectively.

XH C1 C2 C3 C4 C5
0 − 0.7 -5.13 0.63 -0.23 1.3 1.02
< 0.05 -7.15 0.90 -0.13 0.97
0.5 -6.17 0.80 -0.44 0.75

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