GAUFRE: a tool for an automated determination of atmospheric parameters from spectroscopy

TL;DR

GAUFRE is an automated C++ tool that accurately determines atmospheric parameters of F-G-K stars from spectroscopy, incorporating radial velocity, line analysis, and synthetic spectrum fitting, validated against literature and asteroseismic data.

Contribution

The paper introduces GAUFRE, a novel integrated software for automated spectral analysis of stars, combining multiple routines for improved accuracy and efficiency.

Findings

Validated against high-quality literature spectra.

Effective in fixing log(g) using asteroseismic data.

Demonstrated reliable performance on CoRoT star samples.

Abstract

We present an automated tool for measuring atmospheric parameters (T_eff, log(g), [Fe/H]) for F-G-K dwarf and giant stars. The tool, called GAUFRE, is written in C++ and composed of several routines: GAUFRE-RV measures radial velocity from spectra via cross-correlation against a synthetic template, GAUFRE-EW measures atmospheric parameters through the classic line-by-line technique and GAUFRE-CHI2 performs a chi^2 fitting to a library of synthetic spectra. A set of F-G-K stars extensively studied in the literature were used as a benchmark for the program: their high signal-to-noise and high resolution spectra were analysed by using GAUFRE and results were compared with those present in literature. The tool is also implemented in order to perform the spectral analysis after fixing the surface gravity (log(g)) to the accurate value provided by asteroseismology. A set of CoRoT stars, belonging to LRc01 and LRa01 fields was used for first testing the performances and the behaviour of the program when using the seismic log(g).