Fig. 7.

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Comparison between the absolute magnitudes of SU Cyg predicted from P-L relations in the literature (black dots) and the present distance measurement (blue areas), in two photometric bands. The blue areas represent the measured absolute magnitude after correcting for the flux contamination from the companion. The green triangles represent the absolute magnitudes determined from P-L relations from the literature using a fundamentalised pulsation period, with the downwards- and upwards-pointing triangles showing that for the longest (5.757 d) and shortest (5.455 d) converted periods. We see that only modern-era P-L calibrations (including Gaia) seem to correctly predict the luminosity of SU Cyg.
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