Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves. I. Period–Fourier–Metallicity Relations for Fundamental-mode RR Lyrae

@article{Mullen2021MetallicityOG,
  title={Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves. I. Period–Fourier–Metallicity Relations for Fundamental-mode RR Lyrae},
  author={J. P. Mullen and Massimo Marengo and Clara E. Mart{\'i}nez-V{\'a}zquez and Jillian R. Neeley and Giuseppe Bono and M. Dall’ora and Brian Chaboyer and Fr'ed'eric Th'evenin and Vittorio F. Braga and Juliana Crestani and Michele Fabrizio and Giuliana Fiorentino and Christina K Gilligan and Matteo Monelli and Peter B. Stetson},
  journal={The Astrophysical Journal},
  year={2021},
  volume={912}
}
We present newly calibrated period–ϕ 31–[Fe/H] relations for fundamental-mode RR Lyrae stars in the optical and, for the first time, mid-infrared. This work’s calibration data set provides the largest and most comprehensive span of parameter space to date, with homogeneous metallicities from −3 ≲ [Fe/H] ≲ 0.4 and accurate Fourier parameters derived from 1980 ASAS-SN (V band) and 1083 WISE (NEOWISE extension, W1 and W2 bands) RR Lyrae stars with well-sampled light curves. We compare our optical… Expand
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