Evolutionary GENEC and MESA tracks for 60 and 200 M_⊙ from Fig. 1 and additional 100 M_⊙ models, where the thick solid lines represent the segments where the wind is optically thick (Γ_e ≥ 0.5) and X_surf ≥ 0.3. The gray stars correspond to the sample of WNh stars from Martins et al. (2008), the purple stars to the sample of Crowther et al. (2010) and the green stars to the sample of Hamann et al. (2019), tabulated in Table 4. Yellow shadowed area correspond to the HRD region where the HD limit is exceeded.

Table 4.

WNh stars included in Fig. 7.

Notes. (1) Martins et al. (2008); (2) Crowther et al. (2010); (3) Hamann et al. (2019).