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

Many O and B stars show unexplained cyclical variability in their winds, i.e.modulation of absorption features on the rotational timescale, but not strictlyperiodic over longer timescales. For these stars no dipolar magnetic fieldshave been detected, with upper limits below 300 G. Similar cyclical variabilityis also found in many optical lines, which are formed at the base of the wind.We propose that these cyclical variations are caused by the presence ofmultiple, transient, short-lived, corotating magnetic loops, which we call"stellar prominences". We present a simplified model representing theseprominences to explain the cyclical optical wind-line variability in the Osupergiant lambda Cephei. Other supporting evidence for such prominences comesfrom the recent discovery of photometric variability in a comparable O star,which was explained by the presence of multiple transient bright spots,presumably of magnetic origin as well.

"Stellar Prominences" on OB stars to explain wind-line variability