Abundance analysis of HD 22920 spectra
Viktor Khalack, Patrick Poitras
TL;DR
This study analyzes the spectral line variability and elemental abundance stratification of HD 22920 across different rotational phases, revealing vertical stratification and potential phase-dependent abundance changes.
Contribution
It provides the first detailed abundance analysis of HD 22920 using spectropolarimetric data at multiple rotational phases, highlighting vertical stratification and variability.
Findings
Silicon and chromium are vertically stratified in HD 22920's atmosphere.
Silicon abundance stratification may vary with stellar rotation phase.
Spectropolarimetric observations reveal spectral line profile variability.
Abstract
The new spectropolarimetric observations of HD 22920 with ESPaDOnS at CFHT reveal a strong variability of its spectral line profiles with the phase of stellar rotation. We have obtained Teff = 13640 K, logg=3.72 for this star from the best fit of its nine Balmer line profiles. The respective model of stellar atmosphere was calculated to perform abundance analysis of HD 22920 using the spectra obtained for three different phases of stellar rotation. We have found that silicon and chromium abundances appear to be vertically stratified in the atmosphere of HD 22920. Meanwhile, silicon shows hints for a possible variability of vertical abundance stratification with rotational phase.
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