NIR spectroscopy of the Sun and HD20010

Reliable atmospheric parameters for FGK stars have been obtained mostly from methods that rely on high resolution and high signal-to-noise optical spectroscopy. The advent of a new generation of high resolution near-infrared (NIR) spectrographs opens the possibility of using classic spectroscopic methods with high resolution and high signal-to-noise in the NIR spectral window.

We compile a new iron line list in the NIR from a solar spectrum to derive precise stellar atmospheric parameters, comparable to the ones already obtained from high resolution optical spectra. The spectral range covers 10000{AA} to 25000{AA}, which is equivalent to the Y,J,H, and K-bands. Our spectroscopic analysis is based on the iron excitation and ionization balance done in local thermodynamic equilibrium.