Metallicity calibration for solar type stars based on red spectra

TL;DR

This paper develops new metallicity calibration methods for solar-type stars using red spectra, enabling more accurate metallicity determination from low-resolution spectra, especially for metal-rich stars.

Contribution

The study introduces novel metallicity calibrations based on red spectra for solar-type stars, improving accuracy and applicability for low-resolution spectral data.

Findings

Calibration achieves a scatter of 0.26 dex for high S/N stars.

Method provides consistent metallicity estimates with SDSS-DR7 values.

Useful for identifying metal-rich solar-like stars.

Abstract

Based on high resolution and high signal-to-noise ratio (S/N) spectra analysis of 90 solar type stars, we have established several new metallicity calibrations in Teff range [5600, 6500] K based on red spectra with the wavelength range of 560-880 nm. The new metallicity calibrations are applied to determine the metallicity of solar analogs selected from SDSS spectra. There is a good consistent result with the adopted value presented in SDSS-DR7 and a small scatter of 0.26 dex for stars with S/N > 50 is obtained. This study provides a new reliable way to derive the metallicity for solar-like stars with low resolution spectra. In particular, our calibrations are useful for finding metal-rich stars, which are missing in SSPP.