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Fig. 1

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Chandra light curve in the 0.5−10.0 keV band combining events from the zeroth-order image and the HEG and MEG first-order spectra, with 2 ks time bin. Shown above the light curve are images of the excess emission due to accretion (upper row) and of the radial component of the magnetic field (lower row) as reconstructed with quasi-simultaneous Zeeman-Doppler imaging by Donati et al. (2011). Colors scales are as in Donati et al. (red and blue in the lower row indicate positive and negative B-fields, respectively). The images refer to rotational phases at the beginning and the end of each of the two X-ray exposures.

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