J/other/NewA/38.ivo://CDS.VizieR/J/other/NewA/38.50CDSZhang L.Pi Q.Han X.L.Li T.Zhang X.Sang H.Wang D.Wang S.2017-06-01T08:52:35Z2015-08-24T15:11:35ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomyphotometryWe made the first VRI CCD light curves of the short-period contact eclipsing binary GK Aqr, which was observed on October 5 and 8, 2013 at Xinglong station of National Astronomical Observatories, China. The ephemeris of GK Aqr was calculated based on our two newly obtained minima and the minima that other observers obtained previously. We discovered that the orbital period of GK Aqr exhibits an increasing trend of dP/dt=2.8(0.1)x10^-7^days/year by means of fitting the O-C values of the minima. This phenomenon might be explained by mass transfer from the primary (less massive) component to the secondary (more massive) one. With the updated Wilson & Devinney (1971ApJ...166..605W) program, we obtained the photometric orbital parameters for the first time. Using our parameters, we also successfully explained the light curve obtained from the All Sky Automated Survey data. In the end, we concluded that GK Aqr is a near contact binary with a low contact factor of 5.2%. As the mass transfer continues, GK Aqr could become a contact system and evolve into an over-contact system.2015NewA...38...50Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/NewA/38.50CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/NewA/38.50https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/NewA/38.50http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/NewA/38.50https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/NewA/38.50https://vizier.iucaa.in/viz-bin/votable?-source=J/other/NewA/38.50http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/NewA/38.50GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/other/NewA/38.50/table2The photometric data of V R I bands of GK AqrrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-VHeliocentric Julian Date of V band observationdtime.epochdoubledVmagDifferential V band magnitudemagphot.mag;arith.difffloatHJD-R? Heliocentric Julian Date of R band observationdtime.epochdoublenullabledRmag? Differential R band magnitudemagphot.mag;arith.difffloatnullableHJD-I? Heliocentric Julian Date of I band observationdtime.epochdoublenullabledImag? Differential I band magnitudemagphot.mag;arith.difffloatnullableJ/other/NewA/38.50/table3The minimum times and their relevant parameters of GK AqrrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Date of the minimum timedtime.epochdoublee_HJD? rms uncertainty on HJDdstat.error;time.epochfloatnullableType[pri sec] Type of the minimum timemeta.codecharMethodThe method of the minimum time: vis=visual, pg=photographic, or ccdmeta.code;obscharCycle[-22241/30318.5] The cycle of the minimum timedmeta.number;time.perioddouble(O-C)1[-0.07/0.07] (O-C) of the linear fitdstat.fit.residualfloat(O-C)2[-0.03/0.04] (O-C) of the parabolic fitdstat.fit.residualfloatWeight[1/10] The weight of the minimum timestat.weight;phys.atmol.weight;stat.minintSource[1/13] Reference number for minimum time, in refs.dat filemeta.id;meta.mainintJ/other/NewA/38.50/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRef[1/13] Reference numbermeta.id;meta.mainintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar