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Fig. 7


Comparison of the light curves of M31N 2008-12a (black) with the Galactic RNe RS Oph (blue) and U Sco (red) in normalised time scales. Filled black circles, for M31N 2008-12a, indicate V magnitudes as presented in DHS2015 and filled black squares show the X-ray count rates (compare Fig. 2 and Table 1). Blue asterisks, for RS Oph, give the optical (V, visual and y) magnitudes taken from Hachisu et al. (2006) and blue open circles indicate the X-ray count rates (0.3–0.55 keV) taken from Hachisu et al. (2007). Red dots, for U Sco, show the optical magnitudes taken from the AAVSO archive while small open red circles give the X-ray count rate (0.2–1.0 keV) deduced from the Swift archive. The black solid line indicates a theoretical light curve for the SSS blackbody flux from a 1.377 M WD with a chemical composition of X = 0.6, Y = 0.38, and Z = 0.02 between and .

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