Fig. D.1

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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 = 0.15E(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 (0.10.3 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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