J/AJ/149/90ivo://CDS.VizieR/J/AJ/149/90doi:10.26093/cds/vizier.51490090CDSSamec R.G.Kring J.D.Robb R.Van Hamme W.Faulkner D.R.2017-07-06T06:25:32Z2015-03-16T14:43:08ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomybroad-band-photometryGSC 3208 1986 is an NSVS and TYCHO binary, first observed from 1999 to 2000. It is a W UMa binary with a period of 0.405days. The present observations were taken in 2012 September and are of high precision, averaging a standard deviation of better than 5mmag. The amplitude of the light curve is very nearly 0.5mag yet it undergoes total eclipses. Dominion Astrophysical Observatory spectra give an F3V type (T~6900K) for the system, the earliest of the extreme mass ratio W UMa binaries. The linear period determination of 0.4045672days was calculated with the two sets of epochs available. An early NSVS light curve reveals that the period has been smoothly decreasing over its past 12000 orbits. The binary may be undergoing sinusoidal oscillations due to the presence of a third body, possibly with a period of 23+/-3years. The high inclination of 85{deg} results in a long duration secondary total eclipse, lasting some 49.5minutes. Findings indicate that GSC 3208 1986 is an immaculate extreme mass ratio, q(m_2_/m_1_)=0.24, A-type W UMa binary.2015AJ....149...90Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/149/90CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)I/250 : The Tycho Reference Catalogue (Hog+ 1998)J/AJ/149/48 : BVRI light curves of ZZ Eri (Samec+, 2015)J/AJ/147/3 : BV(RI)c light curves of V2421 Cyg (Samec+, 2014)J/AJ/145/14 : BV(RI)c light curves of V1043 Cas (Samec+, 2013)J/PASP/124/693 : HO Psc UBV(RI)c light curves (Samec+, 2012)J/AJ/143/99 : Photometry of W UMa eclipsing binaries (Terrell+, 2012)J/AJ/142/117 : UBVrcIc differential photometry of V1853 Ori (Samec+, 2011)J/AJ/138/466 : NSVS variables automated classification (Hoffman+, 2009)J/AJ/131/621 : A catalog of 1022 bright contact binary stars (Gettel+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/149/90https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/149/90http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/149/90https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/149/90https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/149/90http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/149/90GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/149/90/table2UBVRI photometry of GSC 3208-1986recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFlt[UBVRI] Filter (Johnson-Cousins UBVRI)meta.id;instr.filtercharDmag{Delta} magnitude in filter (in the sense of variable minus comparison star GSC 3208-1967) (1)magphot.mag;arith.difffloatHJDHeliocentric Julian Date (HJD-2456190)dtime.epochfloat