J/MNRAS/430/2029ivo://CDS.VizieR/J/MNRAS/430/2029doi:10.26093/cds/vizier.74302029CDSYildiz M.Dogan T.2024-07-21T20:14:06Z2014-05-23T13:49:02ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsstellar-massesW UMa type binaries have two defining characteristics. These are (i) the effective temperatures of both components are very similar, and (ii) the secondary (currently less massive) component is overluminous for its current mass. We consider the latter to be an indication of its mass before the mass transfer event. For these stars, we define a mass difference ({delta}M) between the mass determined from its luminosity and the present mass determined from fitting the binary orbit. We compare the observed values of the mass difference to stellar models with mass-loss. The range of initial secondary masses that we find for observed W UMa type binaries is 1.3-2.6M_{sun}_. We discover that the A- and the W-subtype contact binaries have different ranges of initial secondary masses. Binary systems with an initial mass higher than 1.8+/-0.1M_{sun}_ become A-subtype while systems with initial masses lower than this become W-subtype. Only 6 per cent of systems violate this behaviour. We also obtain the initial masses of the primaries using the following constraint for the reciprocal of the initial mass ratio: 0<1/q_i_<1. The range of initial masses we find for the primaries is 0.2-1.5M_{sun}_, except for two systems. Finally in comparing our models to observed systems, we find evidence that the mass transfer process is not conservative. We find that only 34 per cent of the mass from the secondary is transferred to the primary. The remainder is lost from the system.2013MNRAS.430.2029Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/430/2029CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/119 : Catalogue of field contact binary stars (Pribulla+, 2003)V/120 : Catalog of early-type contact binaries (Bondarenko+, 1996)J/PASP/108/332 : Photometric analysis of contact binaries (Lapasset+ 1996)J/AcA/51/259 : Contact binaries in OGLE-I database (Szymanski+, 2001)J/A+A/426/1001 : Catalog of contact binary stars (Csizmadia+, 2004)J/AJ/131/621 : Catalog of 1022 bright contact binary stars (Gettel+, 2006)J/AJ/131/633 : A ROSAT survey of contact binary stars (Geske+, 2006)J/AJ/131/2986 : Multiplicity of contact binaries (Pribulla+, 2006)J/AcA/56/253 : Period changes of OGLE contact binaries (Kubiak+, 2006)J/MNRAS/373/1483 : W UMa type and CAB stars dynamical evolution (Eker+, 2006)J/AJ/134/2353 : Observations of contact binaries (Rucinski+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/430/2029https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/430/2029http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/430/2029https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/430/2029https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/430/2029http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/430/2029GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/430/2029/tablea1 (Fundamental properties of the A- and W-subtype contact binaries)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/430/2029/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/430/2029/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/430/2029/tablea1?GETtext/xml+votable180.050000true178.908486147.25739610.0055555555555555566/454 739 1118 1314 1441 1933 2436 2499 2952 3042 3201 3559 3707 4298 4425 4427 4698 5110 5427 5503 5656 5836 6312 7262 8357 8579 8871 9167 9514 9578 9780 9890 9922 9951 10002 10183 11395 11486 11650 12792 13181 13437 13618 13699 13859 14528 14698 16058 16186 18234 19448 19650 19698 19914 21969 22680 22786 24232 24378 24391 24616 24983 26097 27017 27116 27250 27481 27603 27639 27770 28129 28143 28296 28432 28582 30491 30565 31148 31604 31781 31843 31944 31950 32999 33102 33323 35025 36494 36805 37890 40427 41864 42060 43455 44514 44981 46084 47243 47825https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/430/2029?format=asciidefaultJ/MNRAS/430/2029/tablea1Fundamental properties of the A- and W-subtype contact binariesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharType[AW] Contact binary subtypesrc.classcharPer[0.2/0.9] Orbital perioddtime.periodfloatT1Effective temperature of primaryKphys.temperature.effectiveinte_T1? rms uncertainty on T1Kstat.errorintnullableT2Effective temperature of secondaryKphys.temperature.effectiveinte_T2? rms uncertainty on T2Kstat.errorintnullableR1Radius of primarysolRadphys.size.radiusfloate_R1? rms uncertainty on R1solRadstat.errorfloatnullableR2Radius of secondarysolRadphys.size.radiusfloate_R2? rms uncertainty on R2solRadstat.errorfloatnullableL1Luminosity of primarysolLumphys.luminosityfloate_L1? rms uncertainty on L1solLumstat.errorfloatnullableL2Luminosity of secondarysolLumphys.luminosityfloate_L2? rms uncertainty on L2solLumstat.errorfloatnullableM1Mass of primarysolMassphys.massfloate_M1? rms uncertainty on M1solMassstat.errorfloatnullableM2Mass of secondarysolMassphys.massfloate_M2? rms uncertainty on M2solMassstat.errorfloatnullableM2iInitial mass of secondary before the mass transfer (see Section 5)solMassphys.massfloate_M2i? rms uncertainty on M2isolMassstat.errorfloatnullableM1iInitial mass of primary before the mass transfer (see Section 5)solMassphys.massfloate_M1i? rms uncertainty on M1isolMassstat.errorfloatnullable1/qiReciprocal of initial mass ratio (M2i/M1i)phys.mass;arith.ratiofloattMSMS lifetime of the secondary component according to initial massGyrtime.scalefloatRefsReferences, in refs.dat filemeta.ref;pos.framecharSimbadSimbad 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.mainJ/MNRAS/430/2029/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar