Digital Repository

Fractal measures and nonlinear dynamics of overcontact binaries

Show simple item record

dc.contributor.author GEORGE, SANDIP V. en_US
dc.contributor.author Misra, R. en_US
dc.contributor.author AMBIKA, G. en_US
dc.date.accessioned 2019-11-01T03:45:36Z
dc.date.available 2019-11-01T03:45:36Z
dc.date.issued 2020-01 en_US
dc.identifier.citation Communications in Nonlinear Science and Numerical Simulation, 80, 104988. en_US
dc.identifier.issn 1007-5704 en_US
dc.identifier.issn 1878-7274 en_US
dc.identifier.uri http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/4172
dc.identifier.uri https://doi.org/10.1016/j.cnsns.2019.104988 en_US
dc.description.abstract Overcontact binary stars are systems of two stars where the component stars are in contact with each other. This implies that they share a common envelope of gas. In this work we seek signatures of nonlinearity and chaos in these stars by using time series analysis techniques. We use three main techniques, namely the correlation dimension, f(?) spectrum and the bicoherence. The former two are calculated from the reconstructed dynamics, while the latter is calculated from the Fourier transforms of the time series of intensity variations(light curves) of these stars. Our dataset consists of data from 463 overcontact binary stars in the Kepler field of view [1]. Our analysis indicates nonlinearity and signatures of chaos in almost all the light curves. We also explore whether the underlying nonlinear properties of the stars are related to their physical properties like fill-out-factor which is a measure of the extend of contact between the components of an overcontact binary system. We observe that significant correlations exist between the fill out factor and the nonlinear quantifiers. This correlation is more pronounced in specific subcategories constructed based on the mass ratios and effective temperatures of the binaries. The correlations observed can be indicative of variations in the nonlinear properties of the star as it ages. We believe that this study relating nonlinear and astrophysical properties of binary stars is the first of its kind and is an important starting point for such studies in other astrophysical objects displaying nonlinear dynamical behavior. en_US
dc.language.iso en en_US
dc.publisher Elsevier B.V. en_US
dc.subject Overcontact binary en_US
dc.subject Bicoherence Correlation dimension en_US
dc.subject Multifractal spectrum en_US
dc.subject TOC-OCT-2019 en_US
dc.subject 2020 en_US
dc.title Fractal measures and nonlinear dynamics of overcontact binaries en_US
dc.type Article en_US
dc.contributor.department Dept. of Physics en_US
dc.identifier.sourcetitle Communications in Nonlinear Science and Numerical Simulation en_US
dc.publication.originofpublisher Foreign en_US


Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search Repository


Advanced Search

Browse

My Account