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Table 2.
Overview of the types of stars discussed in this paper.
| Name | Teff [kK] | Comment |
|---|---|---|
| Cool SG | < 7 | Includes red and yellow SGs |
| Warm SG | 7 to 20 | |
| Intermediate Teff | 20 to ∼50 | too hot to detect in I Zw 18; |
| too cold for He+ ionization | ||
| Hot He-rich star | ≳50 | has lost its H-rich envelope |
| WR star | ≳50 | a hot He-rich star with winds dense |
| enough to form emission lines |
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