Toward more accurate RR Lyrae metallicities

TL;DR

This paper demonstrates that applying gravity corrections to spectroscopic measurements significantly improves the accuracy of metallicity estimates for RR Lyrae stars, emphasizing the importance of external gravity estimates over full spectrum fitting.

Contribution

It introduces a method for correcting gravity effects in spectroscopic metallicity measurements, resulting in more precise RR Lyrae metallicities compared to previous approaches.

Findings

Gravity correction reduces metallicity measurement scatter.

Tighter correlation with period and Fourier phase predictions.

Significant improvement at ~2 sigma level after corrections.

Abstract

By using a large sample of published spectroscopic iron abundances, we point out the importance of gravity correction in deriving more accurate metal abundances for RR Lyrae stars. For the 197 stars with multiple spectra we find overall [Fe/H] standard deviations of 0.167 (as published), 0.145 (shifted by data source zero points) and 0.121 (both zero point-shifted and gravity-corrected). These improvements are significant at the ~2 sigma level at each correction step, leading to a clearly significant improvement after both corrections applied. The higher quality of the gravity-corrected metallicities is strongly supported also by the tighter correlation with the metallicities predicted from the period and Fourier phase phi_31. This work underlines the need for using some external estimates of the temporal gravity in the chemical abundance analysis rather than relying on a full-fetched spectrum fit that leads to large correlated errors in the estimated parameters.