J/MNRAS/437/185ivo://CDS.VizieR/J/MNRAS/437/185doi:10.26093/cds/vizier.74370185CDSYildiz M.2024-08-07T20:12:26Z2015-01-09T08:28:04ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsstellar-massesstellar-agesRecently, our understanding of the origin of W UMa-type contact binaries has become clearer. Initial masses of their components were successfully estimated by Yildiz and Dogan using a new method mainly based on observational properties of overluminous secondary components. In this paper, we continue to discuss the results and make computations for age and orbital evolution of these binaries. It is shown that the secondary mass, according to its luminosity, also successfully predicts the observed radius. While the current mass of the primary component is determined by initial masses, the current secondary mass is also a function of initial angular momentum. We develop methods to compute the age of A- and W-subtype W UMa-type contact binaries in terms of initial masses and mass according to the luminosity of the secondaries. Comparisons of our results with the mean ages from kinematic properties of these binaries and data pertaining to contact binaries in open and globular clusters have increased our confidence on this method. The mean ages of both A- and W-subtype contact binaries are found as 4.4 and 4.6Gyr, respectively. From kinematic studies, these ages are given as 4.5 and 4.4Gyr, respectively. We also compute orbital properties of A-subtype contact binaries at the time of the first overflow. Initial angular momentum of these binaries is computed by comparing them with the well-known detached binaries. The angular momentum loss rate derived in the present study for the detached phase is in very good agreement with the semi-empirical rates available in the literature. In addition to the limitations on the initial masses of W UMa-type contact binaries, it is shown that the initial period of these binaries is less than about 4.45d.2014MNRAS.437..185Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/437/185CatalogResearchIsServedByTAP 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/MNRAS/430/2029 : W UMa type contact binaries initial masses (Yildiz+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/437/185https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/437/185http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/437/185https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/437/185https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/437/185http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/437/185GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/437/185/tablea1 (Initial and present properties of the A- and W-subtype contact binaries)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/437/185/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/437/185/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/437/185/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/437/185?format=asciidefaultJ/MNRAS/437/185/tablea1Initial and present properties of the A- and W-subtype contact binariesNameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPapIDisplay data of previous paper, Yildiz and Dogan 2013, J/MNRAS/430/2029meta.ref.urlcharType[A/W] Contact binary subtypesrc.classchara[1.4/5.4] Orbital semimajor axissolRadphys.angSize.smajAxisfloatPer[0.2/0.9] Orbital perioddtime.periodfloatM1[0.5/2.8] Mass of primarysolMassphys.massfloate_M1rms uncertainty on M1solMassstat.errorfloatM2[0.1/1.0] Mass of secondarysolMassphys.massfloate_M2rms uncertainty on M2solMassstat.errorfloatM1iInitial mass of primary before the mass transfersolMassphys.massfloate_M1irms uncertainty on M1isolMassstat.errorfloatM2iInitial mass of secondary before the mass transfersolMassphys.massfloate_M2irms uncertainty on M2isolMassstat.errorfloatM2LMass of secondary according to luminositysolMassphys.massfloate_M2Lrms uncertainty on M2LsolMassstat.errorfloatt[1.2/11.1] Age (see Section 3)Gyrtime.agefloate_trms uncertainty on ageGyrstat.errorfloattBAge from Bukowiecki et al. (2012IBVS.6021....1B)Gyrtime.agefloatafofSemimajor axis at first overflow (FOF)solRadphys.angSize.smajAxisfloatPfofOrbital period at FOFdtime.periodfloataD[10/65] Initial orbital semimajor axissolRadphys.angSize.smajAxisfloatPerD[2.7/41] Initial orbital perioddtime.periodfloatSimbadSimbad 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