J/AJ/167/280ivo://CDS.VizieR/J/AJ/167/280doi:10.26093/cds/vizier.51670280CDSJeong M.-J.Kim C.-H.Hong K.Kim H.-Y.Song M.-H.Park J.-H.,Han C.2024-11-06T20:20:22Z2024-07-01T08:14:47ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomybroad-band-photometryspectroscopyNew BVR photometric and high-resolution spectroscopic observations of V505 Lac are presented with Transiting Exoplanet Survey Satellite (TESS) photometric data. The orbital period has experienced a secular decrease during the past 16yr. A clear anticorrelation in the primary and secondary eclipse timing variation (PSETV) obtained from the TESS data is also identified. A double-lined radial velocity (RV) curve is secured, and the effective temperatures of the less- and more-massive stars (Stars 1 and 2, respectively) are measured. Using a spectral subtraction technique, excess emissions are detected in the time-series CaII H and K and H{alpha} lines for Star 2. Simultaneous analysis of the light and RV curves using the Wilson-Devinney (WD) code reveals that V505-Lac is a photospherically and chromospherically active W-subtype contact binary system. The component-star masses and radii are determined to an accuracy of approximately 1%. The WD spot model is individually applied to 221 light curves segmented from the TESS data so as to derive the spot parameters of a cool spot on Star 2. The combined variations in both longitude and colatitude among the spot parameters appear to be strongly associated with those of both the anticorrelation in the PSETV and the O'Connell effect in the TESS light curves. Robust negative linear relationships between the PSETV anticorrelation size and the O'Connell effect magnitude are found for the first time. Mass-radius, mass-luminosity, and mass ratio-mass diagrams of contact binaries, along with the mass ratio frequency distribution, are presented in an attempt to elucidate the evolutionary characteristics of these systems.2024AJ....167..280Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/167/280CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/259 : The Tycho-2 Catalogue (Hog+ 2000)I/337 : Gaia DR1 (Gaia Collaboration, 2016)I/345 : Gaia DR2 (Gaia Collaboration, 2018)IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)VI/120 : High-resolution synthetic stellar library (Coelho+, 2005)J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996)J/A+A/311/523 : Photometry of W UMa (Maceroni+, 1996)J/A+AS/146/103 : CaII H&K to CaII IRT echelle spectra (Montes+, 2000)J/AcA/54/207 : Ephemerids of eclipsing binaries (Kreiner, 2004)J/AJ/142/99 : BVRI observations of TZ Boo (Christopoulou+, 2011)J/MNRAS/430/2029 : Initial masses W UMa type contact binaries (Yildiz+, 2013)J/MNRAS/448/429 : Starspots in short-period Kepler binaries (Balaji+, 2015)J/other/IBVS/6155 : 81th name-list of variable stars. II. (Kazarovets+, 2015)J/AJ/153/231 : BVR photometry of EPIC 211957146 (Sriram+, 2017)J/AJ/158/193 : Photometric data of V582 Lyr and V1016 Oph (Cheng+, 2019)J/ApJS/247/50 : Late-type contact binaries in CSS DR1 (Sun+, 2020)J/AJ/162/147 : Prot of 43 TOIs with Evryscope and TESS (Howard+, 2021)J/AJ/162/13 : Parameters estimation 173 eclipsing binaries (Li+, 2021)J/AJ/161/221 : Photometry & spectroscopy 4 binaries stars (Panchal+, 2021)J/ApJ/927/12 : Long-term photometric analysis of 5 EBs (Panchal+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/167/280https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/167/280http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/167/280https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/167/280https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/167/280http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/167/280GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/167/280/table2BVR measurements of V505 Lac obtained at the SOAOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDB[755/785]? Heliocentric Julian Date; JD-2458000 for B-band measurementsdtime.epochdoublenullableDeltamB[-0.73/-0.39]? B-band magnitude difference between V505 Lac and comparison starmagphot.mag;arith.difffloatnullableHJDV[755/785]? Heliocentric Julian Date; JD-2458000 for V-band measurementsdtime.epochdoublenullableDeltamV[-0.3/0.006]? V-band magnitude difference between V505 Lac and comparison starmagphot.mag;arith.difffloatnullableHJDR[755/785] Heliocentric Julian Date; JD-2458000 for R-band measurementsdtime.epochdoubleDeltamR[-0.09/0.23] R-band magnitude difference between V505 Lac and comparison starmagphot.mag;arith.difffloatJ/AJ/167/280/tablea1All V505 Lac times of minimum lightrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[2453965/2459894] Time of minimum light in Heliocentric Julian Datedtime.epochdoublee_HJD[2e-05/0.005]? Uncertainty in HJDdstat.error;time.epochdoublenullableTypePrimary timing = I, Secondary timing = IIsrc.classcharEpoch[0/18128] Epoch numbermeta.id;meta.mainfloatr_EpochReference for Epoch (1)meta.refcharJ/AJ/167/280/tableb1Variation of spot parameters over timerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEpoch[14597/18092] Epoch calculated from first point of each datasettime.epoch;meta.modelledinttheta[11.12/60.45] Co-latitude of starspotdegpos.galactic.latfloate_theta[0.17/5.08] Uncertainty in thetadegstat.error;pos.posAngfloatphi[136.36/245.75] Longitude of starspotdegpos.galactic.lonfloate_phi[0.58/1.66] Uncertainty in phidegstat.errorfloatrspot[13.98/25.49] Angular radius of starspotdegphys.angSizefloate_rspot[0.05/1.95] Uncertainty in rspotdegstat.errorfloatTs/T*[0.871/0.873] Temperature ratio of local spot to local unspotted star, Tspot/Tstarstat.fit.omcfloate_Ts/T*[0.001/0.003] Uncertainty in Ts/T*stat.errorfloat