Photometric metallicity of Galactic RR Lyrae stars in the Gaia DR3 era
Mahiguhappriya Prakash; Susmita Das; Harinder P. Singh; Nitesh Kumar · 2026 · arXiv
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Abstract (excerpt)
We present a new, calibrated $G$-band relationship between pulsation period $P$, Fourier parameter $φ_{31}$, and metallicity [Fe/H] for galactic RR Lyrae stars from the Gaia survey. A set of 72 fundamental mode RR Lyrae stars were identified for deriving the relation in the $G$-band, after visual examination of their light curves. Unlike recent large-scale calibrations, our relation prioritizes calibration purity by anchoring exclusively to a homogeneously analyzed sample of high-resolution spectroscopic metallicities from the literature. Our best fit relation is $\text{[Fe/H]} = (-6.93 \pm 0.
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Metadata source: arXiv