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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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