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

Exchange of dominance between twin kHz quasi-periodic oscillations (QPOs)observed in some low-mass-X-ray-binaries (LMXB) suggests the possibility of aresonance between two oscillatory modes. We study the behaviour of theeffective gravitational potential around specific resonant radii, and estimatethe role of the higher-order terms governing the non-linear, anharmonicforcing. We discuss the impact it has on the mode amplitude in the linear andnon--linear regimes. We also discuss a related possibility of lowering of theneutron star mass estimates from the highest observed QPO frequencies.

Resonant radii of kHz quasi-periodic oscillations in Keplerian discs orbiting neutron stars