English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Previous observations of the Ap star HD 32633 indicated that its magneticfield was unusually complex in nature and could not be characterised by asimple dipolar structure. Here we derive magnetic field maps and chemicalabundance distributions for this star using full Stokes vector (Stokes $IQUV$)high-resolution observations obtained with the ESPaDOnS and Narvalspectropolarimeters. Our maps, produced using the Invers10 magnetic Dopplerimaging (MDI) code, show that HD 32633 has a strong magnetic field whichfeatures two large regions of opposite polarity but deviates significantly froma pure dipole field. We use a spherical harmonic expansion to characterise themagnetic field and find that the harmonic energy is predominately in the$\ell=1$ and $\ell=2$ poloidal modes with a small toroidal component. At thesame time, we demonstrate that the observed Stokes parameter profiles of HD32633 cannot be fully described by either a dipolar or dipolar plus quadrupolarfield geometry. We compare the magnetic field topology of HD 32633 with otherearly-type stars for which MDI analyses have been performed, supporting a trendof increasing field complexity with stellar mass. We then compare the magneticfield topology of HD 32633 with derived chemical abundance maps for theelements Mg, Si, Ti, Cr, Fe, Ni and Nd. We find that the iron-peak elementsshow similar distributions, but we are unable to find a clear correlationbetween the location of local chemical enhancements or depletions and themagnetic field structure.

The magnetic field topology and chemical abundance distributions of the Ap star HD 32633