J/ApJ/810/61ivo://CDS.VizieR/J/ApJ/810/61doi:10.26093/cds/vizier.18100061CDSMoe M.Stefano R.D.2017-11-06T14:07:14Z2017-10-10T06:15:44ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomybroad-band-photometrystellar-massesstellar-agesstellar-radiieffective-temperatureWe analyze 221 eclipsing binaries (EBs) in the Large Magellanic Cloud with B-type main-sequence (MS) primaries (M_1_~4-14 M_{sun}_) and orbital periods P=20-50 days that were photometrically monitored by the Optical Gravitational Lensing Experiment. We utilize our three-stage automated pipeline to (1) classify all 221 EBs, (2) fit physical models to the light curves of 130 detached well-defined EBs from which unique parameters can be determined, and (3) recover the intrinsic binary statistics by correcting for selection effects. We uncover two statistically significant trends with age. First, younger EBs tend to reside in dustier environments with larger photometric extinctions, an empirical relation that can be implemented when modeling stellar populations. Second, younger EBs generally have large eccentricities. This demonstrates that massive binaries at moderate orbital periods are born with a Maxwellian "thermal" orbital velocity distribution, which indicates they formed via dynamical interactions. In addition, the age-eccentricity anticorrelation provides a direct constraint for tidal evolution in highly eccentric binaries containing hot MS stars with radiative envelopes. The intrinsic fraction of B-type MS stars with stellar companions q=M_2_/M_1_>0.2 and orbital periods P=20-50 days is (7+/-2)%. We find early-type binaries at P=20-50 days are weighted significantly toward small mass ratios q~0.2-0.3, which is different than the results from previous observations of closer binaries with P<20 days. This indicates that early-type binaries at slightly wider orbital separations have experienced substantially less competitive accretion and coevolution during their formation in the circumbinary disk.2015ApJ...810...61Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/810/61CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/118 : Catalog of eclipsing binaries parameters (Perevozkina+, 1999)J/AJ/121/254 : Eclipsing Binaries in OGLE (Rucinski+, 2001)J/AcA/53/1 : OGLE eclipsing binaries in LMC (Wyrzykowski+, 2003)J/AJ/128/1606 : Magellanic Clouds Photometric Survey: the LMCJ/A+A/439/559 : OGLE eclipsing binaries (bulge+lmc+smc) (Groenewegen+, 2005)J/AcA/61/103 : VI light curves of LMC eclipsing binaries (Graczyk+, 2011)J/MNRAS/443/432 : Eclipsing binaries in LMC (Muraveva+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/810/61https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/810/61http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/810/61https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/810/61https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/810/61http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/810/61GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/810/61/table1 (Analytic Model Parameters that Describe the Basic Light Curve Features for the 221 EBs with OGLE-III LMC Catalog Properties 16.0<Imean<17.6, -0.25<V-I<0.20, and P=20-50 days)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/810/61/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/810/61/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/810/61/table1?GETtext/xml+votable180.050000true70.2983333-69.68277780.0055555555555555565/8269 8273 8274 8275 8280 6/33046 33047 33053 33054 33055 33073 33075 33081 33084 33085 33090 33091 33104 33106 33124 33125 33126 33129 37507 37514https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/810/61?format=asciiInfraredOpticaldefaultJ/ApJ/810/61/table2Physical Model Properties and Statistics for the 130 Detached EBs in the Well-defined SampleMpPrimary component masssolMassphys.massfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[91/26109] Identification number (OGLE LMC-ECL-NNNNN in Simbad)meta.id;meta.mainintPerOrbital perioddtime.periodfloatt0Epoch of primary eclipse minimum (JD-2450000)dtime.epochdoubleMsSecondary component masssolMassphys.massfloatAgeAgeMyrtime.agefloatIncInclinationdegsrc.orbital.inclinationfloateccEccentricitysrc.orbital.eccentricityfloatomega[0/359] Argument of periastron {omega}degsrc.orbital.periastronintAII-band dust extinctionmagphys.absorptionfloatqMass ratio (1)phys.massfloatSep[60/145] Orbital separationsolRadpos.angDistance;src.orbitalintRpPrimary stellar radiussolRadphys.size.radiusfloatRsSecondary stellar radiussolRadphys.size.radiusfloatTpPrimary effective temperatureKphys.temperature.effectiveintTsSecondary effective temperatureKphys.temperature.effectiveintfsigmaIPhotometric correction factor in the I-bandphot.mag;arith.difffloatfsigmaVPhotometric correction factor in the V-bandphot.mag;arith.difffloatNI[325/1049] Number of I-band measurementsmeta.numberintNV[31/136] Number of V-band measurementsmeta.numberintNcI[0/3] Number of clipped data points in the I-bandmeta.numberintNcV[0/3] Number of clipped data points in the V-bandmeta.numberintF2Goodness-of-fit statisticstat.fit.goodnessfloatJ/ApJ/810/61/table1Analytic Model Parameters that Describe the Basic Light Curve Features for the 221 EBs with OGLE-III LMC Catalog Properties 16.0<Imean<17.6, -0.25<V-I<0.20, and P=20-50 daysNc[0/2] Number of clipped data pointsmeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCat[1/8] Sample category (1)meta.codeintID[91/26109] Identification number (OGLE LMC-ECL-NNNNN in Simbad) (2)meta.id;meta.mainint<V-I>Mean V-I color indexmagphot.color;em.opt.V;em.opt.IfloatNI[211/1049] Number of I-band measurementsmeta.numberintPerOrbital perioddtime.periodfloatt0Epoch of primary eclipse minimum (JD-2450000)dtime.epochdoublen_t0[a] Note on t0 (3)meta.notechar<Imag>Mean I-band magnitudemagphot.mag;em.opt.IfloatDeltaI1Primary eclipse depthmagphys.absorption.opticalDepthfloatDeltaI2? Secondary eclipse depthmagphys.absorption.opticalDepthfloatnullablePhi2? Orbital phase of secondary eclipsetime.phasefloatnullableTetha1Eclipse width (fraction of the orbital period)stat.fit.paramfloatTetha2? Eclipse width (fraction of the orbital period)stat.fit.paramfloatnullablefsigmaIPhotometric correction factor in I-bandphot.mag;arith.difffloatF2Goodness-of-fit statisticstat.fit.goodnessfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main