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

Open Access

Fig. 4.

Amplitude ratios R₂₁ and R₃₁ against the pulsation periods for the OGLE SMC and LMC as (a) and (b), and with our star sample shown for consistency. The dashed vertical line shows the cut at a period of P = 2.5 days.

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