All Figures

Figure 1: Left panel: slice of the S2 function (in log units) along the plane at fixed parameters M* and (H) set to their optimal values. The solid-line rectangle materializes our spectroscopic estimate (Charpinet et al. 2005a) with its uncertainties for the atmospheric parameters of Feige 48, while the dashed-line and dot-dashed-line rectangles represent the Heber et al. (2000) and Koen et al. (1998) spectroscopic measurements, respectively. Right panel: slice of the S2 function (in log units) along the (H) plane at fixed parameters and set to their optimal values. In both panels, the best-fit model is indicated by a yellow mark, and the rotation period is fixed to 32 500 s with the hypothesis of a solid-body rotator.

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In the text

Figure 2: Slice of the ``projected'' S2 function (in log units) along the plane at fixed parameter M*, set to its optimal value from the best-fit model solution ( ). The rotation period is fixed to 32 500 s, with the hypothesis of a solid-body rotator. The projected (H) parameter was varied between -2.00 and -5.20, in steps of 0.025. The labelled axis positioned along the valley of minimum S2 for the given values of (H). The solid-line, dashed-line and dot-dashed line rectangles represent, with their uncertainties, the spectroscopic estimates for the atmospheric parameters of Feige 48 from Charpinet et al. (2005a), Heber et al. (2000) and Koen et al. (1998), respectively.

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In the text

Figure 3: Slice of the ``projected'' S2 function (in log units) along the plane at fixed parameter (H), set to its optimal value from the best-fit model solution ((H ) = - 2.52). The rotation period is fixed to 32 500 s, with the hypothesis of a solid-body rotator. The projected M* parameter was varied between 0.40  and 0.60 , in steps of 0.0025 . The labelled axis positioned along the valley of minimum S2 for the given values of M*. The solid-line, dashed-line and dot-dashed line rectangles represent, with their uncertainties, the spectroscopic estimates for the atmospheric parameters of Feige 48 from Charpinet et al. (2005a), Heber et al. (2000) and Koen et al. (1998), respectively.

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In the text

	Figure 4: Merit function S2 (in logarithmic units) versus rotation period (in seconds) in the hypothesis of a solid-body rotator. All other structural parameters are fixed to their optimal values.
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In the text

	Figure 5: Merit function S2 (in logarithmic units) as a function of the rotation period of the core (in s). The surface rotation is fixed at the optimal value of 32 500 s found for solid-body rotation.
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In the text