Fig. 6

Location of the components (+symbols) of ζ Orionis A in the theoretical plane of the HR diagram, based on the photometric parallax of 2.6 mas and bolometric corrections of −2.84 for the primary and −2.72 mag for the secondary (Flower 1996). Stellar evolution tracks of a 25 M⊙ star (solid line) and of a 15 M⊙ star (dashed line) are shown, and asterisks are used to mark the primary at an age of 6.4 Myr and the secondary at an age of 7.2 Myr.
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