J/AJ/161/292ivo://CDS.VizieR/J/AJ/161/292doi:10.26093/cds/vizier.51610292CDSSamec R.G.Chamberlain H.Caton D.Wolf M.Zasche P.Kucakova H.,Hornoch K.Morgan S.Faulkner D.R.2022-03-16T12:08:32Z2021-09-08T07:35:35ZCDS support team

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

cds-question@unistra.frmultiple-starsinfrared-photometryvisible-astronomybroad-band-photometryV642Vir is a polar spotted, well-detached, UV Leo-type, low-mass, pre-WUMa (T1~4250K, ~K6V) eclipsing binary. It was observed in 2020 April, May, and June at the Dark Sky Observatory in North Carolina, USA with the 0.81m reflector of Appalachian State University. A total of 88 timings were used in our 22-year period study which included 12 Transiting Exoplanet Survey Satellite (TESS) timings. The O-C plots show a low-amplitude oscillation of residuals that points to the existence of an orbiting third body, a dwarf of minimum mass, 0.15M{sun} in an eccentric orbit (e=0.41), with an orbital period of 20.07yr. The odd light curves of V642 Virginis indicate that it has polar spots similar to UV Leo and the recently published V1023Per. Its present large polar spot region indicates that it must have a strong magnetic field and that it is synchronously rotating. The BVR_c_I_c_ simultaneous Wilson-Devinney Program solution gives a detached binary (primary and secondary components are underfilling their respective Roche Lobes, with 76% and 78% fill outs respectively). The cool spot region models near the pole of the primary component (centered at 10{deg} colatitude) and is angled toward the secondary component. Its large radius (68{deg}) and T-fact (T_spot_/T_surface_=0.69) also attest to the conclusion of the strength of the magnetic field. The small {Delta}T in the components (~318K) and mass ratio near unity (0.9542{+/-}0.0005) show that the stars are similar in spectral type (secondary ~K9V). The inclination is high, ~86.87{+/-}0.04{deg}, yet there is no time of constant light due to the two stars essentially equal radii.2021AJ....161..292Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/161/292CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/136/1067 : New beta Lyrae and Algol candidates in NSVS (Hoffman+, 2008)J/ApJ/723/1469 : Flux calibrations and WZ Oph photometry (Wilson+, 2010)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/A+A/578/A136 : Period changes in SuperWASP eclipsing binaries (Lohr+, 2015)J/AJ/160/175 : BVRcIc light curve eclisping binary V1023 Persei (Samec+, 2020)http://var2.astro.cz/ocgate/ : Database of times of minima and maximahttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/161/292https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/161/292http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/161/292https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/161/292https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/161/292http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/161/292GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/161/292/table1Photometric Observations of V642 VirrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDBmag[1.21/2.29]? Differential B-band magnitudemagphot.mag;arith.difffloatnullableHJDB[5/58]? Heliocentric Julian date of B band observations; HJD-2458950dtime.epochfloatnullableDVmag[0.79/1.81]? Differential V-band magnitudemagphot.mag;arith.difffloatnullableHJDV[5/58]? Heliocentric Julian date of V band observations; HJD-2458950dtime.epochfloatnullableDRmag[0.46/1.43] Differential R-band magnitudemagphot.mag;arith.difffloatHJDR[5/58] Heliocentric Julian date of R band observations; HJD-2458950dtime.epochfloatDImag[0.12/0.96]? Differential I-band magnitudemagphot.mag;arith.difffloatnullableHJDI[5/58]? Heliocentric Julian date of I band observations; HJD-2458950dtime.epochfloatnullableJ/AJ/161/292/table3O-C Residuals, Period Study V642 VirrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEpoch[51273/59261]? Epoch, Heliocentric Julian Date, HJD-2400000dtime.epoch;pos.heliocentricdoublenullableCycle[-2/15458]? Cycleobs.proposal.cyclefloatnullableRLin[-0.008/0.007] Linear Residualsstat.fit.residualdoubleROrb[-0.003/0.002] EC Orbit Residualsstat.fit.residualdoubleWT[0/1]? Weightstat.weightfloatnullableRIni[-0.008/0.007]? Initial Residualsstat.fit.residualfloatnullableRQuad[-0.003/0.005] Quadratic Residualsstat.fit.residualdoubleRefReference (1)meta.ref;pos.framechar