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Fig. 10


Best spot model solutions for CTTS (magenta circles) and WTTS (blue squares) in NGC 2264 are statistically compared. A typical error bar is shown as a black cross in the upper left corner of the diagram. Error estimates result from the uncertainties on the photometric amplitudes, following the procedure described in Sect. 3.4.1, plus a lower order correction accounting for uncertainties on the photospheric temperature (Tphot) and on the shape of the limb-darkening coefficients μ(λ). The red vertical line marks the zero-value temperature difference between stellar photosphere and spot distribution. For CTTS, objects dominated by stochastic accretion bursts are marked in orange, while green triangles correspond to AA Tau-like objects. Histograms shown in side panels at the top and to the right of the diagram compare the CTTS (magenta) vs. WTTS (blue) distribution in spot properties (temperature difference relative to the stellar photosphere and percentage of surface covered, respectively). The heights of histogram bars are normalized to the highest channel count in each distribution.

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