J/AJ/152/120ivo://CDS.VizieR/J/AJ/152/120doi:10.26093/cds/vizier.51520120CDSHe J.-J.Qian S.-B.Soonthornthum B.2017-07-18T15:04:10Z2017-05-24T15:03:46ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsvisible-astronomybroad-band-photometryThe first two sets of complete charge-coupled device light curves in the B and V bands of the short-period binary system, V532 Mon, are presented. The light curves are analyzed with spot models using the Wilson-Devinney code. V532 Mon is found to be an A-subtype intermediate-contact binary with a degree of contact factor of f=47.1%(+/-2.7%), a mass ratio of q=0.2502(+/-0.0019), and a cool spot on the primary component. The period changes of the system are investigated by combining newly determined times of light minimum with others published in the literature. We found that the general trend of the observed-calculated (O-C) curve shows a downward parabolic variation that corresponds to a long-term decrease in the orbital period at a rate of dP/dt=-1.716(+/-0.002)*10^-7^dyr^-1^. The long-term decrease of the orbital period can be explained by mass transfer from the more-massive component to the less massive one. The long-time period decrease, the intermediate-contact configuration, and the astrophysical parameters of the binary system suggest that V532 Mon will evolve into high fill-out, extreme mass-ratio overcontact binaries.2016AJ....152..120Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/152/120CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/317 : The PPMXL Catalog (Roeser+ 2010)V/119 : Catalogue of field contact binary stars (Pribulla+, 2003)J/other/IBVS/5984 : Minima and maxima of 503 variables (Hubscher, 2011)J/other/IBVS/5918 : Minima and maxima of 452 variables (Hubscher+, 2010)J/other/IBVS/5874 : Minima and maxima of 299 variables (Hubscher+, 2009)J/other/IBVS/5802 : Minima and maxima of 735 variables (Hubscher+, 2007)J/AJ/131/2986 : Multiplicity of contact binaries (Pribulla+, 2006)J/other/IBVS/5493 : 2003 CCD minima of eclipsing binaries (Nelson+, 2004)J/other/IBVS/5296 : Extrema of pulsating stars (Agerer+, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/152/120https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/152/120http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/152/120https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/152/120https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/152/120http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/152/120GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/152/120/table1 (Coordinates and color index of V532 Mon, the comparison, and the check stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/152/120/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/152/120/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/152/120/table1?GETtext/xml+votable180.050000true106.12769167-0.351513890.0055555555555555566/221171.143914381504295e-19 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/152/120?format=asciiOpticaldefaultJ/AJ/152/120/photometryCCD photometric data of V532 Mon in the B band (table2) and in the V band (table3) (recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBandB or V bandinstr.bandpasscharHJD[27/52.3] Heliocentric Julian Date (HJD-2453000)dtime.epochdoubleDmag[0.43/1.37] The differential magnitude (1)magphot.mag;arith.difffloatJ/AJ/152/120/table1Coordinates and color index of V532 Mon, the comparison, and the check starsNameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintf_NameFlag on Name (V=Variable, C=Comparison, CH=Check)meta.codecharRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.mainJmagThe J-band magnitude (1)magphot.mag;em.IR.JfloatHmagThe H-band magnitude (1)magphot.mag;em.IR.HfloatPPMXLDisplay the data from the PPMXL catalog (Roeser et al. 2010, Cat. I/317)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/152/120/table5(O-C) values of light minimum times for V532 MonrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDLight minimum time in Heliocentric Julian Date (HJD-2400000)dtime.epochdoubleMin[ps] Type of minimum (P=primary, or s=secondary)meta.codecharMethDetection method (pg=photographic and visual data, or CCD=photoelectric and CCD observations)meta.code;obscharE[-50858/7078] Eclipse numbermeta.number;time.perioddoubleO-C[-0.0688/0.04] The (O-C) value (observational time-calculational time of the light minimum) (1)stat.fit.residualfloatRes[-0.0202/0.0305] Residualstat.fit.residualfloatRefReferencemeta.ref;pos.framechar