Dynamical analyses of the companions orbiting eclipsing binaries – I. SW Lacertae

dc.contributor.authorŞenavcı, Hakan Volkan
dc.contributor.departmentFen Fakültesitr_TR
dc.date.accessioned2020-02-17T20:48:07Z
dc.date.available2020-02-17T20:48:07Z
dc.date.issued2014
dc.description.abstractNewmid-eclipsetimesoftheshort-periodeclipsingbinarySWLacertaearereported,andtwo cyclical variations are found in the corresponding O−C diagram. The proposed light-travel timemodelisrefined.Thebestfitsuggeststhattwopossiblecircumbinarycompanionsareina near 3:1 mean-motion resonance with periods of 27.01 and 82.61yr. Based on the best-fitting solution,wehavestudiedthestabilitiesofthetwocompanionsmovingonaseriesofmutually inclinedorbits.Theresultsshowthatnoorbitalconfigurationscansurvivefor>1000yr.Then, non-Keplerian corrections to the initial conditions and the more distant K-dwarf companion discovered by Ruci´nski, Pribulla & van Kerkwijk, moving on assumed circular orbits with wide ranges of orbital inclinations, are considered in our numerical simulations. The outcome similarlyrevealsthatthewholesystemisyetshort-termunstable.Perhaps,oneorbothcyclical variations in the mid-eclipse times are attributed to irregular mass exchange and/or magnetic cycles in the magnetically active W UMa system. Despite this, the instability of the system may also arise from the large uncertainties in orbital parameters. So, secular observations of this target are needed to determine the eccentricity of the outmost companion and the orbital period of the middle companion with much higher precision. Our results suggest that, if the two inner companions do exist, they should be on mutually inclined orbits of >100◦, with the minimum masses of 0.62 and 1.94M for the innermost and middle components, respectively. Our work demonstrates that it is important and necessary to perform dynamical analyses before a discovery of two or more circumbinary companions is announcedtr_TR
dc.description.indexWos
dc.identifier.endpage886tr_TR
dc.identifier.issn/e-issn0035-8711
dc.identifier.issn/e-issn1365-2966
dc.identifier.issue1tr_TR
dc.identifier.startpage878tr_TR
dc.identifier.urihttps://doi.org/10.1093/mnras/stu010tr_TR
dc.identifier.urihttp://hdl.handle.net/20.500.12575/69683
dc.identifier.volume439tr_TR
dc.language.isoentr_TR
dc.relation.isversionof10.1093/mnras/stu010tr_TR
dc.relation.journalMonthly Notices of the Royal Astronomical Societytr_TR
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıtr_TR
dc.rightsCC0 1.0 Universal*
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/*
dc.subjectmethods: numerical–binaries: close–binaries: eclipsing–stars: individual: SW Lacertae.tr_TR
dc.titleDynamical analyses of the companions orbiting eclipsing binaries – I. SW Lacertaetr_TR
dc.typeArticletr_TR

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