J/ApJS/235/5ivo://CDS.VizieR/J/ApJS/235/5doi:10.26093/cds/vizier.22350005CDSQian S.-B.Zhang J.He J.-J.Zhu L.-Y.Zhao E.-G.Shi X.-D.Zhou X.,Han Z.-T.2021-02-23T07:34:54Z2018-09-20T06:51:38ZCDS support team

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

cds-question@unistra.freclipsing-binary-starseffective-temperaturestellar-spectral-typesmetallicityradial-velocityAbout 3196 EA-type binaries (EAs) were observed by LAMOST by 2017 June 16 and their spectral types were derived. Meanwhile, the stellar atmospheric parameters of 2020 EAs were determined. In this paper, those EAs are cataloged and their physical properties and evolutionary states are investigated. The period distribution of EAs suggests that the period limit of tidal locking for the close binaries is about 6 days. It is found that the metallicity of EAs is higher than that of EW-type binaries (EWs), indicating that EAs are generally younger than EWs and they are the progenitors of EWs. The metallicities of long-period EWs (0.4<P<1 days) are the same as those of EAs with the same periods, while their values of Log (g) are usually smaller than those of EAs. These support the evolutionary process that EAs evolve into long-period EWs through the combination of angular momentum loss (AML) via magnetic braking and case A mass transfer. For short-period EWs, their metallicities are lower than those of EAs, while their gravitational accelerations are higher. These reveal that they may be formed from cool short-period EAs through AML via magnetic braking with little mass transfer. For some EWs with high metallicities, they may be contaminated by material from the evolution of unseen neutron stars and black holes or they have third bodies that may help them to form rapidly through a short timescale of pre-contact evolution. The present investigation suggests that the modern EW populations may have formed through a combination of these mechanisms.2018ApJS..235....5Qhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/235/5CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)B/gcvs : General Catalogue of Variable Stars (Samus+, 2007-2017)V/146 : LAMOST DR1 catalogs (Luo+, 2015)V/153 : LAMOST DR4 catalogs (Luo+, 2018)J/MNRAS/357/497 : Kinematics of W UMa-type binaries (Bilir+, 2005)J/MNRAS/373/1483 : W UMa type and CAB stars dynamical evolution (Eker+, 2006)J/AJ/131/2986 : Multiplicity of contact binaries (Pribulla+, 2006)J/AJ/132/769 : Radial velocities of 10 close binaries (Pribulla+, 2006)J/AJ/133/1977 : Radial velocities of 10 close binaries (Pribulla+, 2007)J/AJ/136/586 : Radial velocities of 10 close binaries (Rucinski+, 2008)J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)J/AJ/137/3646 : Radial velocities of 10 close binaries (Pribulla+, 2009)J/MNRAS/405/1930 : Period changes of EA-, EB- & EW-types bin. (Liao+, 2010)J/other/RAA/11.924 : Atmospheric parameters for 771 stars (Wu+, 2011)J/A+A/525/A71 : Atmospheric parameters for 1273 stars (Wu+, 2011)J/AJ/146/101 : LINEAR. III. Periodic variables (Palaversa+, 2013)J/AJ/145/39 : Differential BV(RI)c light curves of PY Vir (Zhu+, 2013)J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014)J/MNRAS/437/185 : W UMa-type contact binaries ages and masses (Yildiz, 2014)J/AJ/149/120 : Times of minimum light for TY UMa (Li+, 2015)J/A+A/594/A39 : LAMOST-Kepler param. & activity indicators (Frasca+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/235/5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/235/5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/235/5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/235/5https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/235/5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/235/5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/235/5/table2 (The catalog of the stellar atmospheric parameters for EAs observed by LAMOST)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/235/5/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/235/5/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/235/5/table2?GETtext/xml+votable180.050000true0.1477543.014810.005555555555555556Cone search capability for table J/ApJS/235/5/table3 (Spectral types of EAs determined by LAMOST)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/235/5/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/235/5/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/235/5/table3?GETtext/xml+votable180.050000true0.0303718.738080.0055555555555555564/922 923 933 5/291 295 300 437 1590 3358 3645 3646 3647 3683 3704 3706 3730 3736 3738 3739 3742 3743 3776 3777 3779 3780 3782 3783 3785 3786 3788 3789 3792 5965 5990 6/1 12 36 41 57 83 128 149 178 233 240 241 264 268 284 286 307 311 318 320 333 337 339 351 355 359 369 371 373 388 401 405 407 409 410 411 414 423 436 438 449 454 457 465 466 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49110https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/235/5?format=asciidefaultJ/ApJS/235/5/table2The catalog of the stellar atmospheric parameters for EAs observed by LAMOSTSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNobsNumber of observations for this starmeta.numberintnullableNameVariable star identifiermeta.id;meta.maincharprimarySpT2Dislay the spectral type determined by LAMOST for this star (link to Table 3)meta.ref.urlintnullableMeanDisplay the mean parameters for EAs observed 4 times or more (link to table 1)meta.ref.urlcharRAJ2000VSX right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000VSX declination in decimal degrees (J2000)degpos.eq.dec;meta.mainTypeVariability type, as in GCVS catalogmeta.ref;pos.framecharPer[0.2/1324.3]? Period of the variable from the VSX catalogdtime.perioddoublenullablef_Per[:N] Flag on Per (G1)meta.codecharSep[0/2] Distance between VSX and LAMOST coordinatesarcsecpos.angDistancefloatDateObserved datetime.epochnullableSpTMK spectral typesrc.spTypecharTeff[3880/8490] Effective temperatureKphys.temperature.effectivefloate_Teff[1.4/790]? Error in TeffKstat.error;phys.temperature.effectivedoublenullablelogg[1.7/5] Logarithm of acceleration of gravitylog(cm.s**-2)phys.gravityfloate_logg[0/1.2]? Error in logglog(cm.s**-2)stat.errordoublenullable[Fe/H][-1.7/0.7] Metallicitylog(Sun)phys.abund.Zfloate_[Fe/H][0/0.8]? Error in [Fe/H]log(Sun)stat.error;phys.abund.FedoublenullableRV[-214/176] Radial velocitykm/sphys.veloc;pos.heliocentricfloate_RV[0.3/91]? Error in RVkm/sstat.errordoublenullableLAMOSTDisplay the LAMOST DR4 catalog (V/153) within 2"meta.ref.urlintnullableJ/ApJS/235/5/table3Spectral types of EAs determined by LAMOSTrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNobsNumber of observations for this starmeta.numberintnullableNameVariable star identifiermeta.id;meta.maincharPDislay the stellar atmospheric parameters for this star (link to table 2)meta.ref.urlintnullableRAJ2000VSX right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000VSX declination in decimal degrees (J2000)degpos.eq.dec;meta.mainTypeVariability type, as in GCVS catalogmeta.idcharPer[0.1/25245]? Period of the variable from the VSX catalogdtime.perioddoublenullablef_PerFlag on Per (G1)meta.codecharSep[0/2] Distance between VSX and LAMOST coordinatesarcsecpos.angDistancefloatDateObserved datetime.epochnullableSpTMK spectral typesrc.spTypecharLAMOSTDisplay the LAMOST DR4 catalog (V/153) within 2"meta.ref.urlintnullableJ/ApJS/235/5/table1Mean atmospheric parameters and their standard errors for 62 EAs observed 4 times or morerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameVariable star identifiermeta.id;meta.maincharPer[0.3/98]? Orbital perioddtime.perioddoublenullableNobs[4/7] Number of observationsmeta.numberintTeff[4272/7448] Averaged effective temperatureKphys.temperature.effectivefloate_Teff[9/251] Error in TeffKstat.error;phys.temperature.effectivefloatlogg[2.6/4.7] Averaged log of gravitational accelerationlog(cm.s**-2)phys.gravityfloate_logg[0.01/0.3] Error in logglog(cm.s**-2)stat.errorfloat[Fe/H][-0.71/0.4] Metallicitylog(Sun)phys.abund.Zfloate_[Fe/H][0.008/0.2] Error in [Fe/H]log(Sun)stat.error;phys.abund.Fefloat