Table 1
Atmospheric mass fractions (in percentage) and mean molecular weights.
| Composition | XH | XHe | XC | XN | XO | Σi≠H,He,C,N,O Xi | µion |
|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) |
| Solar | 74.91 | 23.77 | 0.2191 | 0.0704 | 0.5824 | 0.4481 | 0.5942 |
| WC8-9 | 0 | 60 | 31 | 0 | 7 | 2 | 1.5385 |
| WN5-7 | 0 | 95.5 | 0.029 | 1 | 0.018 | 0.453 | 1.3536 |
| WN8-9 and Ofpe/WN9 | 11.5 | 82.4 | 0.0124 | 1.15 | 0.066 | 4.872 | 1.1383 |
Notes. The solar abundances were taken from Lodders (2003). The abundances for the three WR subtypes correspond to the compilation by Russell et al. (2017) based on previous studies (Herald et al. 2001; Crowther 2007; Onifer et al. 2008). Column 1: chemical mixture. Columns 2–7: hydrogen, helium, carbon, nitrogen, oxygen, and rest of the metals mass fractions, respectively. Column 8: mean molecular weight assuming full ionisation.
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