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Fig. 4


Left panel: comparison between effective temperatures obtained by MTR 13 from the SpT with the temperature scale of Luhman et al. (2003) and those derived here with ROTFIT. Right panel: surface gravity vs. effective temperature both derived with ROTFIT and compared with the predictions of evolutionary PMS models by Baraffe et al. (1998) and Chabrier et al. (2000), for which we show as black lines the 1, 10, and 100 Myr isochrones (from top to bottom). Different colors and plotting symbols denote stars from the three SFRs: green triangles – σ Ori, orange squares – Lupus, red circles – TWA. Sz 121 and Sz 122 are excluded from the right panel because their broad lines did not allow us to determine the gravity.

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