Metallicity estimations of MW, SMC, and LMC classical Cepheids from the shape of the V- and I-band light curves

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Fig. 11.

Histogram of A₁, ϕ₂₁ and R₄₁ for Cepheids with pulsation period between 12 and 40 days for metal-rich ([Fe/H] > −0.19) and metal-poor ([Fe/H] < −0.19) stars. [Fe/H] = −0.19 dex represents the median of the metallicity sample of long-period Cepheids. (a) A₁. (b) ϕ₂₁. (c) R₄₁.

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