All Figures

	Figure 1: OM UVW2 lightcurve of AA Tau in the OM magnitude system ( upper panel); sine-curves with p=8.2 d and 8.5 d are overplotted. Comparison light curves for the stars LDN 1529 6 and LDN 1529 40 are shown in the middle panels. The EPIC pn light curve (1.0-7.5 keV) for AA Tau is plotted in the bottom panel; all errors are 1.
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In the text

	Figure 2: EPIC pn X-ray spectra of AA Tau (crosses) with 1 errors including spectral fit (solid line histogram) and assuming an isothermal plasma (vapec) for the observations on Feb. 14 (black) and on Feb. 16 (red); see Table 1 for model parameters. Note both the change in flux level and photoelectric absorption.
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In the text

	Figure 3: Time-dependent emission measure ( upper panel), temperature ( middle panel) and absorption column density ( bottom panel) as derived from the XMM-Newton EPIC spectra; all errors are 90%.
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In the text

Figure 4: Sketch of the model geometry of AA Tau and its disk. All units are in stellar radii. The x-axis represents the plane of the disk and some field lines (blue) of a dipole inclined by 52 and the magnetic equator are also shown. The system is symmetric w.r.t. the disk plane, except for the warp. The observer is viewing into the system at an angle of 15 at the phase of minimal/maximal optical/UV brightness (solid black lines); the red line is the line of sight towards a possible X-ray corona in the magnetic equatorial regions. The yellow region represents the accretion curtain, the dark blue regions the disk warp and an outer thinner disk, and the turquoise region the assumed wind zone.

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In the text

	Figure 5: Scatter plot between OM UVW2 count rate and X-ray absorption ( upper panel) and X-ray luminosity ( lower panel) respectively.
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In the text