J/other/NewA/55.ivo://CDS.VizieR/J/other/NewA/55.13CDSYu Y.-X.Zhang X.-D.Hu K.Xiang F.-Y.2017-12-11T10:40:22Z2017-12-11T11:36:07ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.freclipsing-binary-starsThe orbital period variations of two W UMa-type contact binaries, UY UMa and EF Boo, are analyzed by using all available times of light minimum. It is detected that the general trends of their (O-C) curves show an upward parabolic variation, which reveals their continuous period increases at the rates of dP/dt=2.545x10^-7^days/yr and dP/dt=2.623x10^-7^days/yr respectively. Meanwhile, UY UMa also shows a cyclic period variation with a small amplitude of A=0.0026-days superposed on the long-term increase. Due to their contact configurations, the secular period increases are interpreted as a result of mass transfer from the less massive component to the more massive one. The cyclic period variation of UY UMa may be interpreted in terms of either the magnetic activity or the light time effect.2017NewA...55...13Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/NewA/55.13CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/NewA/55.13https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/NewA/55.13http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/NewA/55.13https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/NewA/55.13https://vizier.iucaa.in/viz-bin/votable?-source=J/other/NewA/55.13http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/NewA/55.13GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/other/NewA/55.13/table3All compiled times of light minimum for the contact binary EF BooMetMethodmeta.code;obscharType[I ] Type of minimameta.code;src.varchare_HJD? Error on HJDdstat.error;time.epochfloatnullableEpochEpochdtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoubleO-CObserved minus computed residualstat.fit.residual;stat.fit.omcdoubleRefReference, in refs,dat filemeta.ref;pos.frame;meta.filecharJ/other/NewA/55.13/table2All compiled times of light minimum for the contact binary UY UMarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoubleType[I ] Type of minimameta.code;src.varchare_HJD? Error on HJDdstat.error;time.epochfloatnullableMetMethodmeta.code;obscharEpochEpochdtime.epochdoubleO-CObserved minus computed residualstat.fit.residual;stat.fit.omcdoubleRefReference, in refs,dat filemeta.ref;pos.frame;meta.filecharJ/other/NewA/55.13/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.notecharBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar