Fig. 5.
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Comparison of [Fe/H] from the literature and from the fitted empirical relations based on (a) A1A2 and (b) R21 for short-period Cepheids. The number of points used in the fit is indicated (Ndat) as well as the rms of the fit. Dashed lines represent the rms deviation to guide the eye. (a) [Fe/H] = 6.27 A1 − 11.73 A2 − 0.59. (b) [Fe/H] = −2.42 R21 + 0.84.
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