Gaia-ESO Survey: Empirical classification of VLT/Giraffe stellar spectra in the wavelength range 6440–6810 Å in the γ Velorum cluster, and calibration of spectral indices

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Model isochrones in the (T_eff,log g) plane, for both PMS stars in the age range 0.1–50 Myr and ZAMS stars (solid lines, from Siess et al. 2000), and evolved stars in the age range 10 Myr–10 Gyr (dashed lines, from Marigo et al. 2008). Isochrone ages are labeled in Myr units.

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