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Fig. 4


Top left: flux-calibrated spectra #7, #8, #9, and #1 of the data of 29 November 1995 in Fig. 3 (black curves) and mean bright-phase spectrum of the 1991 high state (red curve). No extinction corrections have been applied. Bottom left: cyclotron spectrum measured at orbital phase φ = 0.53, least-squares fitted with a model spectrum for an isothermal plasma of kT = 9.5 keV in a field of B = 31.8 MG (red curve). The numbers indicate the cyclotron harmonics. Top right: mean dereddened spectrum of 11 and 29 November 1995 near orbital minimum (upper solid black curve). Overplotted in red is the sum of the dM4e secondary (lower solid black curve) and a smooth underlying continuum (dotted black curve). Also shown is the SDSS griz photometry of 28 September 2009 (red filled circles), which can be represented by the secondary and a WD of 15 000 K (blue curve). Bottom right: dereddened flare spectrum and blackbody fit to the continuum.

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