J/other/NewA/51.ivo://CDS.VizieR/J/other/NewA/51.59CDSLu H.-P.Zhang L.-Y.Han X.L.Pi Q.-F.Wang D.-M.2017-09-04T08:27:29Z2017-08-08T15:46:13ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomyWide-band photometryWe present a low-dispersion spectrum and two sets of CCD photometric light curves of the eclipsing binary LY And for the first time. The spectrum of LY And was classified as G2. We derived an updated ephemeris based on all previously available and our newly acquired minimum light times. Our analyses of LY And light curve minimum times reveals that the differences between calculated and observed minimum times for LY And can be represented by an upward parabolic curve, which means its orbital period is increasing with a rate of 1.88 (+/-0.13)x10^-7^days/year. This increase in orbital period may be interpreted as mass transfer from the primary component to the secondary component, with a rate of dM1/dt=-4.54x10^-8^M_{sun}_/year. By analyzing our CCD photometric light curves obtained in 2015, we obtained its photometric solution with the Wilson-Devinney program. This photometric solution also fits very well our light curves obtained in 2014. Our photometric solution shows that LY And is a contact eclipsing binary and its contact factor is f=(17.8+/-1.9)%. Furthermore, both our spectroscopic and photometric data show no obvious chromospheric activity of LY And.2017NewA...51...59Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/NewA/51.59CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/NewA/51.59https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/NewA/51.59http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/NewA/51.59https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/NewA/51.59https://vizier.iucaa.in/viz-bin/votable?-source=J/other/NewA/51.59http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/NewA/51.59GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfraredOpticaldefaultJ/other/NewA/51.59/table2Original photometric data of LY And observed by the 1-m RCC reflecting telescope at Yunnan Observatory on November 24, 2014recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-RHeliocentric Julian date for R-banddtime.epochdoubledRmagDifferential R magnitudemagphot.mag;em.opt.R;arith.difffloatHJD-I? Heliocentric Julian date for I-banddtime.epochdoublenullabledImag? Differential I magnitudemagphot.mag;em.opt.I;arith.difffloatnullableJ/other/NewA/51.59/table5Minimum times and their relevant parameters of LY AndrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoublee_HJD? rms uncertainty on HJDdstat.error;time.epochdoublenullableEpochEpochdtime.epochdoubleMeth[pg ccd] Methodmeta.notecharType[pri sec] Type of minimameta.codecharWeight[1/5] Weightstat.weight;phys.atmol.weightint(O-C)IObserved minus computer for primary minimumdstat.fit.residualfloat(O-C)IIObserved minus computer for secondary minimumdstat.fit.residualfloatRef[1/9] Reference (1)meta.ref;pos.frameintJ/other/NewA/51.59/table3Original photometric data of LY And observed by the 914-mm SARA telescope at Kitt Peak National Observatory on October 23, 2015recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-BHeliocentric Julian date for B-banddtime.epochdoubledBmagDifferential B magnitudemagphot.mag;em.opt.B;arith.difffloatHJD-VHeliocentric Julian date for V-banddtime.epochdoubledVmagDifferential V magnitudemagphot.mag;em.opt.V;arith.difffloatHJD-RHeliocentric Julian date for R-banddtime.epochdoubledRmagDifferential R magnitudemagphot.mag;em.opt.R;arith.difffloatHJD-IHeliocentric Julian date for I-banddtime.epochdoubledImagDifferential I magnitudemagphot.mag;em.opt.I;arith.difffloat