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Fig. 1


Multi-wavelength light curves of QS Tel, folded on the orbital period. Phase zero corresponds to the inferior conjunction of the secondary star. a) − c) EPIC/pn light curves. d) Hardness ratio HR1  =  (H − S)/(H + S) between the counts in the 0.1−0.5 keV and in the 0.5−2.0 keV ranges. e) Ultraviolet OM light curve in the 2050−2450 Å band. All XMM-Newton data are shown in time bins of 100 s. f) Optical SMARTS light curve, obtained simultaneously to the XMM-Newton observation. The data have been plotted twice, to the left with the original cycle time of 100 s, to the right rebinned into intervals of 300 s.

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