Hyperfine Structure and Abundances of Heavy Elements in 68 Tauri (HD 27962)

TL;DR

This study models the spectrum of 68 Tauri to determine its chemical abundances, emphasizing the impact of hyperfine structure on barium measurements and utilizing updated atomic data for accuracy.

Contribution

It introduces a detailed analysis of hyperfine structure effects on barium abundance in a chemically peculiar star using high-resolution spectra and updated atomic parameters.

Findings

Hyperfine structure significantly affects barium abundance estimates.

Updated atomic parameters improve abundance accuracy.

Spectral modeling confirms chemical peculiarities of 68 Tauri.

Abstract

HD 27962, also known as 68 Tauri, is a Chemically Peculiar Am star member of the Hyades Open Cluster in the local arm of the Galaxy. We have modeled the high resolution SOPHIE (R=75000) spectrum of 68 Tauri using updated model atmosphere and spectrum synthesis to derive chemical abundances in its atmosphere. In particular, we have studied the effect of the inclusion of Hyperfine Structure of various Baryum isotopes on the determination of the Baryum abundance in 68 Tauri. We have also derived new abundances using updated accurate atomic parameters retrieved from the NIST database.