An Updated Line List for Spectroscopic Investigation of G Stars- I: Redetermination of the Abundances in the Solar Photosphere

TL;DR

This paper presents an updated line list for spectroscopic analysis of G-type stars, refining atomic data and solar abundances, and identifying inconsistencies in existing line lists to improve stellar abundance determinations.

Contribution

It introduces a new, carefully curated line list with accurate gf-values for G-type star analysis, and highlights discrepancies in previous line lists used in major surveys.

Findings

Identified 363 reliable spectral lines for G-type stars.

Discovered significant inconsistencies in Gaia-ESO line list gf-values.

Provided refined solar abundance estimates based on new line data.

Abstract

We propose a line list that may be useful for the abundance analysis of G-type stars in the wavelength range 4080 -- 6780 A. It is expected that the line list will be useful for surveys/libraries with overlapping spectral regions (e.g. ELODIE/SOPHIE libraries, UVES-580 setting of Gaia-ESO), and in particular for the analysis of F- and G-type stars in general. The atomic data are supplemented by detailed references to the sources. We estimated the Solar abundances using stellar lines and the high-resolution Kitt Peak National Observatory (KPNO) spectra of the Sun to determine the uncertainty in the log gf values. By undertaking a systematic search that makes use of the lower excitation potential and gf-values and using revised multiplet table as an initial guide, we identified 363 lines of 24 species that have accurate gf-values and are free of blends in the spectra of the Sun and a Solar analogue star, HD 218209 (G6V), for which accurate and up-to-date abundances were obtained from both ELODIE and PolarBASE spectra of the star. For the common lines with the Gaia-ESO line list v.6 provided by the Gaia-ESO collaboration, we discovered significant inconsistencies in the gf-values for certain lines of varying species.