Metallicity calibration for solar type stars based on red spectra

摘要

Based on a high resolution and high signal-to-noise ratio(S/N) spectral analysis of 90 solar-type stars,we have established several new metallicity calibrations in the Teff range [5600,6500]K based on red spectra with the wavelength range of 560-880nm.The new metallicity calibrations are applied to determine the metallicity of solar analogs selected from Sloan Digital Sky Survey(SDSS) spectra.There is a good consistent result with the adopted value presented in SDSS-DR7 and a small scatter of 0.26dex for stars with S/N > 50 being 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 the SEGUE Stellar Parameter Pipeline.