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Fig. 9


Top left: amplitude ratios – AJ/AV – as a function of the period for LMC and MW calibrating Cepheids. The dashed vertical lines display the individual bins in period. The color coding is the same as in Fig. 1: orange dots for the P04 sample, red dots for the MP sample, and blue dots for the LS sample. The black solid lines are the mean amplitude ratios estimated on the selected period ranges: P ≤ 20 days and P> 20 days. The error bars in the top left corner show the typical photometric error. Top right: same as the left, but for SMC calibrating Cepheids (green dots). The comparison between the value of the mean ratio in the left and in right panels shows that amplitude ratios of SMC Cepheids are systematically lower than those of LMC+MW Cepheids. Middle: same as the top, but for the AH/AV amplitude ratios. Bottom: same as the top, but for the AKs/AV amplitude ratios. Note that the period ranges for this band are P ≤ 15.5 days and P> 15.5 days.

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