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Table 7
Luminosity criteria for types O9–O9.7 (Sota et al. 2011).
| Lum. | He II/He I (a) | Si IV/He I(b) |
|---|---|---|
| class | λ4686/λ4713 | λ4089/λ4026 |
| Ia | ~0 | N/A |
| Iab | ≪ to < | ≥ to ≤ |
| Ib | ≤ | ≤ |
| II | = | < |
| III | > | < to ≪ |
| V | ≫ | ≪ |
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