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

Joseph P. Mullen, Massimo Marengo, Clara E. Martínez-Vázquez, Jillian R. Neeley, Giuseppe Bono, Massimo Dall'Ora, Brian Chaboyer, Frédéric Thévenin, Vittorio F. Braga, Juliana Crestani, Michele Fabrizio, Giuliana Fiorentino, Christina K. Gilligan, Matteo Monelli, Peter B. Stetson

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

Resumen

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 period-φ 31-[Fe/H] relation with those available in the literature and demonstrate that our relation minimizes systematic trends in the lower and higher metallicity range. Moreover, a direct comparison shows that our optical photometric metallicities are consistent with both those from high-resolution spectroscopy and globular clusters, supporting the good performance of our relation. We found an intrinsic scatter in the photometric metallicities (0.41 dex in the V band and 0.50 dex in the infrared) by utilizing large calibration data sets covering a broad metallicity range. This scatter becomes smaller when optical and infrared bands are used together (0.37 dex). Overall, the relations derived in this work have many potential applications, including large-area photometric surveys with James Webb Space Telescope in the infrared and LSST in the optical.

Idioma originalInglés
Número de artículo144
PublicaciónAstrophysical Journal
Volumen912
N.º2
DOI
EstadoPublicada - 10 may 2021
Publicado de forma externa

Áreas temáticas de ASJC Scopus

  • Astronomía y astrofísica
  • Ciencias planetarias y espacial

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