Fig. 3.
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PW relations for RR Lyr stars (RRab+RRc) based on mean reddenings from Schlafly & Finkbeiner (2011), the reddening vector (Rλ) from Green et al. (2019) and Gaia DR3 parallaxes. Filled circles and squares mark RRab and RRc stars adopted for derivation of the PW relations, respectively; open circles and squares: RRab and RRc stars with RUWE > 1.4, respectively; black solid and dashed gray lines: the fit to Equation (6) for RRab and RRc, separately; magenta solid line: the fit to Equation (4) for RRab+RRc stars; shaded areas: ±3rms.
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