J/AJ/169/85ivo://CDS.VizieR/J/AJ/169/85doi:10.26093/cds/vizier/be-59-2nCDSXu X.Li K.Liu F.Yan Q.-X.Wang Y.-F.Cui X.-Y.Wang J.-Y.,Gao X.Sun G.-Y.Wu C.-Y.Li M.-Z.-M.2026-07-02T11:52:29Z2025-11-24T14:39:29ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsphotometryspectroscopyvisible-astronomyinfrared-astronomymultiple-starsWe performed photometric and spectroscopic studies of three large amplitude contact binaries: NSVS 2418361, ATLAS J057.1170+31.2384, and NSVS 7377875. The amplitudes of these three systems' light curves are more than 0.7mag. We analyzed the light curves using the Wilson-Devinney code to yield physical parameters. The photometric solutions suggested that NSVS 7377875 belongs to an A-subtype contact binary, while the others are classified as W-subtype ones. Furthermore, the mass ratio of NSVS 7377875 is higher than 0.72, so it belongs to H-subtype contact binaries. Since their light curves have unequal height at two maxima, which is called the O'Connell effect, a dark spot on the primary component for each target was required to get a better fit of the light curves. The orbital period investigation shows that the period of NSVS 2418361 is increasing, indicating a mass transfer from the the less massive component to the more massive one, while the other targets exhibit no long-term variation. Our spectral subtraction analysis of LAMOST spectra revealed excess emissions in the H{alpha} line, indicating chromospheric activity in all the three targets. The Gaia distance was applied to estimate the absolute parameters of the three targets, and we obtained their evolutionary state. The relationships between the energy transfer parameter of 76 H-subtype contact binaries and their bolometric luminosity ratios, as well as their contact degree, were presented. We discovered that H-subtype systems have less efficient energy transfer rate, which corresponds to the conclusion proposed by Csizmadia & Klagyivik.2025AJ....169...85Xhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/169/85CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/156 : LAMOST DR7 catalogs (Luo+, 2019)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)V/119 : Catalogue of field contact binary stars (Pribulla+, 2003)J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)J/A+AS/133/7 : V photometry of YY CMi (Niarchos+ 1998)J/A+A/426/1001 : Catalog of contact binary stars (Csizmadia+, 2004)J/ApJ/629/1055 : Evolution of close binary systems (Yakut+, 2005)J/MNRAS/373/1483 : W UMa type and CAB stars dynamical evolution (Eker+, 2006)J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)J/other/A+ARV/17.251 : Stars observed with Doppler imaging (Strassmeier, 2009)J/MNRAS/412/1787 : Physical parameters of 62 eclipsing binaries (Deb+, 2011)J/other/BASI/40.51 : Cl* NGC 2539 CKY V3 and V4 BV light curves (Kiron+, 2012)J/AJ/143/99 : Photometry of W UMa eclipsing binaries (Terrell+, 2012)J/AJ/146/157 : Differential BVRI photometry of FI Boo (Christopoulou+, 2013)J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)J/AJ/145/9 : BVRI LCs of the early-type binary V382 Cyg (Yasarsoy+, 2013)J/MNRAS/430/2029 : Initial masses of W UMa type contact binar. (Yildiz+, 2013)J/AJ/145/39 : Differential BV(RI)c light curves of PY Vir (Zhu+, 2013)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/MNRAS/448/2890 : Observation of six NSVS eclipsing binaries (Dimitrov+, 2015)J/A+A/590/A45 : GU Mon BV light curves (Lorenzo+, 2016)J/PASJ/69/62 : First analysis of the binary IK Boo (Kriwattanawong+, 2017)J/MNRAS/473/2004 : TESS-HERMES Survey Data Release 1 catalog (Sharma+, 2018)J/AJ/158/104 : LL Com BVR bands photometry & times of light minimum (Hu+, 2019)J/AJ/157/111 : Study of three early-type contact twin binaries (Yang+, 2019)J/AJ/159/189 : Eclipse timings for 9 contact binaries (Li+, 2020)J/ApJS/247/50 : Late-type contact binaries in CSS DR1 (Sun+, 2020)J/ApJ/922/122 : BVRcIc LCs of two contact binaries (Li+, 2021)J/AJ/162/13 : Parameters estimation for 173 eclipsing binaries (Li+, 2021)J/ApJS/256/14 : RVs from LAMOST MRS DR7 stellar spectra (Zhang+, 2021)J/AJ/164/202 : Extrem. Low Mass Ratio Contact Binaries I. 10 syst. (Li+, 2022)J/A+A/672/A176 : Mass-ratio distribution of contact binary stars (Pesta+, 2023)J/ApJS/271/32 : ASAS-SN eclipsing contact binaries with Gaia DR3 (Li+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/169/85https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/169/85http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/169/85https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/169/85https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/169/85http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/169/85GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/169/85/targets (List of targets (Table added by CDS with data from Table 1))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/169/85/targets?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/169/85/targets?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/169/85/targets?GETtext/xml+votable180.050000true57.117012831.23844610.005555555555555556Cone search capability for table J/AJ/169/85/table13 (Physical parameters of 52 H-subtype contact binaries)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/169/85/table13?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/169/85/table13?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/169/85/table13?GETtext/xml+votable180.050000true122.6601394-12.83815610.0055555555555555566/227 1397 1945 2435 2438 2566 3814 4020 4427 6471 6594 6740 7092 7166 7225 7653 8088 9354 10324 10355 11785 11830 12294 12701 12729 13079 13159 13696 14484 14619 14751 15488 21718-21719 21962 22208 22460 23015 24522 25835 26391 26566 27619 33317 36494 40656 40696 47131https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/169/85?format=asciiOpticalInfrareddefaultJ/AJ/169/85/targetsList of targets (Table added by CDS with data from Table 1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDTarget identifiermeta.id;meta.maincharprimarySimbadSimbad identifiermeta.idcharSimbadNameSimbad column added by the CDSmeta.idcharnullableLCLight curvemeta.ref.urlcharPer[0.25/0.36] Perioddtime.perioddoubleVmag[13.4/15.5] V-band magnitudemagphot.mag;em.opt.VfloatAmp[0.75/0.83] Amplitudemagsrc.var.amplitude;phot.magfloatNphNumber of photometric measurements for this targetmeta.numberintnullableNOCNumber of O-C values for this targetmeta.numberintnullableO-CO-C diagrammeta.ref.urlcharResResidualsmeta.ref.urlchar_RAPositions from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad (declination part)degpos.eq.dec;meta.mainJ/AJ/169/85/table3Photometric observation of J034828, J073802, and J084000IDTarget identifier (1)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFilt1Filter in light curve 1 (2)instr.bandpasscharHJD1? Heliocentric Julian date, light curve 1dtime.epochdoublenullabledMag1[0.09/1.93]? Magnitude difference, light curve 1magphot.mag;arith.difffloatnullableFilt2? Filter in light curve 2 (2)instr.bandpasscharHJD2? Heliocentric Julian date, light curve 2dtime.epochdoublenullabledMag2[0.02/1.65]? Magnitude difference, light curve 2magphot.mag;arith.difffloatnullableFilt3? Filter in light curve 3 (2)instr.bandpasscharHJD3? Heliocentric Julian date, light curve 3dtime.epochdoublenullabledMag3[4e-3/0.81]? Magnitude difference, light curve 3magphot.mag;arith.difffloatnullableJ/AJ/169/85/table9Eclipsing times and O-C values of the three targetsIDTarget identifier (1)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[2454002/2460340] Barycentric Julian Datedtime.epochdoublee_BJD[0/9e-3] Uncertainty in BJDdstat.error;time.epochfloatE[-24852/2169] Cycle numbermeta.numberdoubleO-C[-0.03/0.02] Observed - Modeldstat.param;meta.modelleddoubleRes[-0.011/0.012] Mean Residualdstat.fit.residualdoubleTelTelescope (2)meta.id;instr.telcharJ/AJ/169/85/table13Physical parameters of 52 H-subtype contact binariesRefReference(s) (3)meta.refcharSimbadNameSimbad column added by the CDSmeta.idcharnullable_RAPositions from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad (declination part)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameTarget Namemeta.id;meta.maincharTypeType (1)src.classcharPer[0.21/1.89] Perioddtime.periodfloatq[0.7/1] Mass ratiophys.mass;arith.ratiofloatf[1e-3/0.92] Fill-out factor (2)stat.paramfloatTemp1[3942/36000] Temperature, PrimaryKphys.temperatureintTemp2[3692/34415] Temperature, SecondaryKphys.temperatureintMass1[0.5/27.9]? Mass, PrimarysolMassphys.massfloatnullableMass2[0.4/20.8]? Mass, SecondarysolMassphys.massfloatnullableRad1[0.6/782]? Radius, PrimarysolRadphys.size.radiusfloatnullableRad2[0.5/8.5]? Radius, SecondarysolRadphys.size.radiusfloatnullableL1[0.1/141906]? Luminosity, PrimarysolLumphys.luminositydoublenullableL2[0.07/89950]? Luminosity, SecondarysolLumphys.luminositydoublenullable