J/AJ/143/122ivo://CDS.VizieR/J/AJ/143/122doi:10.26093/cds/vizier.51430122CDSYang Y.-G.Qian S.-B.Soonthornthum B.2017-06-28T06:58:04Z2013-06-26T09:20:47ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomyphotometryccd-photometryWe present precision CCD photometry, a period study, and a two-color simultaneous Wilson code solution of the short-period contact binary CK Bootis. The asymmetric light curves were modeled by a dark spot on the primary component. The result identifies that CK Boo is an A-type W UMa binary with a high fillout of f=71.7(+/-4.4)%. From the O-C curve, it is found that the orbital period changes in a complicated mode, i.e., a long-term increase with two sinusoidal variations. One cyclic oscillation with a period of 10.67(+/-0.20)yr may result from magnetic activity cycles, which are identified by the variability of Max. I-Max. II. Another sinusoidal variation (i.e., A=0.0131days(+/-0.0009days) and P3=24.16(+/-0.64)yr) may be attributed to the light-time effect due to a third body. This kind of additional companion can extract angular momentum from the central binary system. The orbital period secularly increases at a rate of dP/dt=+9.79(+/-0.80)*10^-8days/yr, which may be interpreted by conservative mass transfer from the secondary to the primary. This kind of deep, low-mass ratio overcontact binaries may evolve into a rapid-rotating single star, only if the contact configuration do not break down at J_spin_>(1/3)J_orb_.2012AJ....143..122Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/143/122CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2013)J/A+A/546/A69 : Orbits of visual binaries & dynamical masses (Malkov+, 2012)J/MNRAS/412/1787 : Physical parameters of 62 eclipsing binaries (Deb+, 2011)J/AJ/142/117 : UBVrcIc differential photometry of V1853 Ori (Samec+, 2011)J/MNRAS/412/1787 : Physical parameters of 62 eclipsing binaries (Deb+, 2011)J/AJ/134/2353 : Observations of contact binaries (Rucinski+, 2007)J/A+A/446/785 : Catalogue of eclipsing variables (Malkov+, 2006)J/AJ/131/2986 : Multiplicity of contact binaries (Pribulla+, 2006)J/MNRAS/357/497 : Kinematics of W UMa-type binaries (Bilir+, 2005)J/A+A/426/1001 : Catalog of contact binary stars (Csizmadia+, 2004)J/AcA/54/207 : Ephemerids of eclipsing binaries (Kreiner, 2004)J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/143/122https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/143/122http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/143/122https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/143/122https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/143/122http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/143/122GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/143/122/table2New obtained light minimum times of CK BooTelTelescope usedinstr.setupcharHJDHeliocentric Julian Date (1)dtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinte_HJDUncertainty on HJDdstat.error;time.epochdoubleMin[I/II] Minimum type (I=primary, II=secondary)meta.notenullableFilt[BVRI] Photometric filter (B, V, R or I)meta.notecharJ/AJ/143/122/table3All available light minimum times of CK BoorecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleMethDetection method (pe=photoelectric or CCD)meta.code;obscharEpochEpochtime.epochdoubleMin[I/II] Minimum type (I=primary, II=secondary)meta.codenullable(O-C)1The (O-C)_1_ value of the eclipse time (1)dstat.fit.residualfloatf_(O-C)2[d] Discarded (O-C)_2_ value (2)meta.codechar(O-C)2? The (O-C)_2_ value of the eclipse time (3)dstat.fit.residualfloatnullableRefReference (in refs.dat file)meta.ref;pos.framecharJ/AJ/143/122/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.maincharprimaryBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharJ/AJ/143/122/table1VR Photometric Observations of CK Boo in 2011recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-VHeliocentric Julian Date of V band observationdtime.epochdoubleDVmagDifferential V band magnitude (1)magphot.mag;em.opt.V;arith.difffloatHJD-R? Heliocentric Julian Date of R band observationdtime.epochdoublenullableDRmag? Differential R band magnitude (1)magphot.mag;em.opt.R;arith.difffloatnullable