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

The orbits of binary stars precess as a result of general relativisticeffects, forces arising from the asphericity of the stars, and forces fromadditional stars or planets in the system. For most binaries, the theoreticaland observed precession rates are in agreement. One system, however -- DIHerculis -- has resisted explanation for 30 years. The observed precession rateis a factor of four slower than the theoretical rate, a disagreement that oncewas interpreted as evidence for a failure of general relativity. Among thecontemporary explanations are the existence of a circumbinary planet and alarge tilt of the stellar spin axes with respect to the orbit. Here we reportthat both stars of DI Herculis rotate with their spin axes nearly perpendicularto the orbital axis (contrary to the usual assumption for close binary stars).The rotationally induced stellar oblateness causes precession in the directionopposite to that of relativistic precession, thereby reconciling thetheoretical and observed rates.

Misaligned spin and orbital axes cause the anomalous precession of DI Herculis