J/PASJ/69/62ivo://CDS.VizieR/J/PASJ/69/62doi:10.26093/cds/vizier/bj-25-1yCDSKriwattanawong W.Sanguansak N.MaungKorn S.2026-03-17T20:05:37Z2018-01-11T11:56:41ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsephemeridesinfrared-photometryvisible-astronomybroad-band-photometryWith new CCD observations of the W UMa type binary IK Boo, we present the first investigation of photometric parameters and orbital period change. The BVRc light curve fit shows that IK Boo is a W-type contact system with a mass ratio of q=1.146 and a shallow contact with a fill-out factor of f=2.22%. The orbital period decrease is found at a rate of -3.28x10^-7^d/yr, corresponding to a mass transfer from the more massive to the less massive component with a rate of -2.83x10^-6^M_{sun}/yr. The inner and outer critical Roche lobes will contract and cause the contact degree to increase. Therefore, IK Boo may evolve into a deeper contact system. Furthermore, a possible cyclic variation is found to have a period of 9.74yr, that could be explained by the light-travel time effect, due to the existence of a third companion in the system.2017PASJ...69...62Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASJ/69/62CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/311/523 : Photometry of W UMa (Maceroni+, 1996)J/A+A/336/920 : HD 163151: a new W UMa type system (Rodriguez+ 1998)J/MNRAS/357/497 : Kinematics of W UMa-type binaries (Bilir+, 2005)J/AJ/143/99 : Photometry of W UMa eclipsing binaries (Terrell+, 2012)J/AJ/144/149 : CCD photometry of W UMa type TY Boo (Christopoulou+, 2012)J/AJ/146/70 : Spectroscopy of W UMa-type binary stars (Rucinski+, 2013)J/MNRAS/430/2029 : Initial masses of W UMa type contact binaries (Yildiz+ 2013)J/MNRAS/437/185 : W UMa-type contact binaries ages and masses (Yildiz, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASJ/69/62https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASJ/69/62http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASJ/69/62https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASJ/69/62https://vizier.iucaa.in/viz-bin/votable?-source=J/PASJ/69/62http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASJ/69/62GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/PASJ/69/62/table1Times of minimum light for IK BooMinTypes of minimummeta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date at light minimumdtime.epochdoubleRefReferences for the sourcesmeta.refcharEEpochtime.epochfloatO-CO-Cdtime;arith.difffloatJ/PASJ/69/62/table5CCD photometric observations in BVRc filter bands for IK BoorecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-BHeliocentric Julian date of B band observation (HJD-2457000)dtime.epochdoubledBmagDifferential B band magnitudemagphot.mag;em.opt.B;arith.difffloatHJD-VHeliocentric Julian date of V band observation (HJD-2457000)dtime.epochdoubledVmagDifferential V band magnitudemagphot.mag;em.opt.V;arith.difffloatHJD-RcHeliocentric Julian date of Rc band observation (HJD-2457000)dtime.epochdoubledRcmagDifferential Rc band magnitudemagphot.mag;em.opt.R;arith.difffloat