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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We studied the variability of the magnetic O-type supergiant $\zeta$ Ori Aausing multi-colour BRITE photometry. We confirmed the known rotation frequency$f_{\rm rot} = 0.15 \pm 0.02$ c/d, and detected some of its higher harmonics,of which $4f_{\rm rot}$ is compatible with the known DAC recurrence timescale.Thanks to simultaneous high-resolution CHIRON spectroscopy, we could identifyanother frequency $f_{\rm env} = 0.10 \pm 0.02$ c/d, caused by thecircumstellar environment. Variations in the circumstellar environment arebelieved to cause the observed difference between the BRITE lightcurves.

Understanding the photometric variability of {\zeta} Ori Aa