Near-infrared two colour diagrams. The full dataset is shown with the same color coding as in Fig. 7 and the location of Cepheids (Laney & Stobie 1992), after correction for interstellar reddening, (assuming the reddening law from Laney & Stobie 1993 and AL = 0.15 E(B − V)) is shown for comparison. The arrow shows the effect of correcting HR5171A for interstellar reddening of E(B − V) = 1.13 mag (van Genderen 1992), following the same reddening law. We note that there may well be additional reddening due to circumstellar extinction of uncertain characteristics, evidenced by the spread (0.1−0.3 mag) of the temporal measurements. Nevertheless, the corrected colors are similar to those of the Cepheids, with an excess of emission that increases at longer wavelengths.
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