Inversion of stellar fundamental parameters from Espadons and Narval high-resolution spectra

TL;DR

This study develops a fast, PCA-based inversion tool to accurately derive stellar parameters from high-resolution spectra obtained by Espadons and Narval spectropolarimeters, focusing on efficiency and reliability.

Contribution

The paper introduces a novel PCA-based method for rapid and reliable inversion of stellar parameters from high-resolution spectra, tailored for Espadons and Narval data.

Findings

Effective temperature, surface gravity, metallicity, and rotational velocity can be accurately derived.

The method performs well using spectra around the Mg I b-triplet for FGK stars.

Results are promising for spectral analysis and stellar characterization.

Abstract

The general context of this study is the inversion of stellar fundamental parameters from high-resolution Echelle spectra. We aim indeed at developing a fast and reliable tool for the post-processing of spectra produced by Espadons and Narval spectropolarimeters. Our inversion tool relies on principal component analysis. It allows reduction of dimensionality and the definition of a specific metric for the search of nearest neighbours between an observed spectrum and a set of observed spectra taken from the Elodie stellar library. Effective temperature, surface gravity, total metallicity and projected rotational velocity are derived. Various tests presented in this study, and done from the sole information coming from a spectral band centered around the Mg I b-triplet and with spectra from FGK stars are very promising.