All Figures

Figure 1: The V-band residuals compared to the Freedman et al. (2001) PL relation are plotted against the iron content measured from FEROS and UVES spectra. Left panel: results for the individual stars (grey symbols: Galaxy as circles, LMC as star symbols, SMC as squares) and median value in each metallicity bin (filled black squares) with its associated errorbar. Right panel: filled squares represent the median value in each metallicity bin, with is associated errorbar. The open square includes the three stars with metallicity from Andrievsky et al. (2002a,b) and radius from Laney & Stobie (1995). The metallicity dependence as inferred by Kennicutt et al. (1998) from two Cepheid fields in M 101 (open circles) is shown as a full line. The dashed line shows the theoretical predictions by Fiorentino et al. (2002) for a helium-to-metal enrichment of and the observed period and V-K distributions of the programme stars.

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