HR diagram for NGC 2264 members investigated in this study (gray circles). Isochrones at 1, 3 and 10 Myr, traced in red on the diagram, are extracted from Baraffe et al.’s (2015) models, as well as mass tracks in the 0.2–1.4 M⊙ mass range (black curves); mass tracks from Siess et al.’s (2000) PMS evolutionary models are adopted for objects that lie above Baraffe et al.’s M⋆ = 1.4 M⊙ track, that is, the highest mass included in the PMS model tracks published by Baraffe et al. (2015). The mass track at M⋆ = 1.8 M⊙ from Siess et al. (2000) is shown in blue as an example.
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