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

Overcontact binary stars are systems of two stars where the component starsare in contact with each other. This implies that they share a common envelopeof gas. In this work we seek signatures of nonlinearity and chaos in thesestars by using time series analysis techniques. We use three main techniques,namely the correlation dimension,f (\alpha) spectrum and the bicoherence. Theformer two are calculated from the reconstructed dynamics, while the latter iscalculated from the Fourier transforms of the time series of intensityvariations(light curves) of these stars. Our dataset consists of data from 463overcontact binary stars in the Kepler field of view [1]. Our analysisindicates nonlinearity and signatures of chaos in almost all the light curves.We also explore whether the underlying nonlinear properties of the stars arerelated to their physical properties like fill-out-factor, a measure of theextend of contact between the components of an overcontact binary system . Weobserve that significant correlations exist between the fill out factor and thenonlinear quantifiers. This correlation is more pronounced in specificsubcategories constructed based on the mass ratios and effective temperaturesof the binaries. The correlations observed can be indicative of variations inthe nonlinear properties of the star as it ages. We believe that this studyrelating nonlinear and astrophysical properties of binary stars is the first ofits kind and is an important starting point for such studies in otherastrophysical objects displaying nonlinear dynamical behaviour.

Fractal Measures and Nonlinear Dynamics of Overcontact Binaries