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Fig. 2

image

V-band (left panels) and J-band (right panels) normalized light-curves for Galactic bump Cepheids in the LS sample. The period increases from bottom to top. For all these light-curves the phase φ = 0 was fixed according to the maximum brightness in the V band and was marked with the arrow and the red circle. However, the J-band maximum brightness, marked by the arrow, moves across the light-curves, and occurs at later phases than the optical maximum. The drift in phase arises because the secondary bump can be brighter than the true maximum, that corresponds to the phase of minimum radius along the pulsation cycle. The overplotted orange dots show the position of the mean magnitude along the rising branch, which we adopt as the new phase zero-point (φ = 0).

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