Ionization ratios and elemental abundances in the atmosphere of 68 Tauri

TL;DR

This study determines ionization ratios and elemental abundances in the atmosphere of 68 Tauri using synthetic spectra and updated atomic data, providing new insights into its chemical composition.

Contribution

It introduces a detailed analysis of ionization ratios and elemental abundances in 68 Tauri with improved atomic data and modeling techniques.

Findings

Determined ionization ratios for twelve elements in 68 Tauri.

Derived elemental abundances including those related to the Am phenomenon.

Extended previous abundance studies with updated atomic data.

Abstract

We have derived the ionization ratios of twelve elements in the atmosphere of the star 68 Tauri (HD 27962) using an ATLAS9 model atmosphere with 72 layers computed for the effective temperature and surface gravity of the star. We then computed a grid of synthetic spectra generated by SYNSPEC49 based on an ATLAS9 model atmosphere in order to model one high resolution spectrum secured by one of us (RM) with the echelle spectrograph SOPHIE at Observatoire de Haute Provence. We could determine the abundances of several elements in their dominant ionization stage, including those defining the Am phenomenon. We thus provide new abundance determinations for 68 Tauri using updated accurate atomic data retrieved from the NIST database which extend previous abundance works.