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Fig. 12


Estimated ratios of truncation-to-corotation radius (RT/RC, left) and truncation-to-stellar radius (RT/R, right), as a function of rotation period for a subsample of CTTS in NGC 2264 with period measurements from this study and stellar and accretion parameters measured from Venuti et al. (2014). The estimates of RT and RC are obtained following Bessolaz et al. (2008), in the assumption that steady accretion funnels are formed. Circles correspond to truncation radius estimates obtained assuming that the sonic Mach number at the disk midplane (mS) is equal to 1; the lower bar associated with each point marks by how much the values of RT or RT/RC would vary if we adopted mS = 0.5 (see Bessolaz et al. 2008). Red is used for objects with a mass ratio Mcore/M between the radiative core and the total mass of the star equal to 0 (i.e., fully convective objects); yellow identifies objects in the 0 <Mcore/M< 0.4 group; blue is for objects with Mcore/M> 0.4. Different dipolar field strengths are used in the computation of RT for each of these groups (see text).

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