J/AJ/146/58ivo://CDS.VizieR/J/AJ/146/58doi:10.26093/cds/vizier.51460058CDSJeffries M.W.JrSandquist E.L.Mathieu R.D.Geller A.M.Orosz J.A.,Milliman K.E.Brewer L.N.Platais I.Brogaard K.Grundahl F.,Frandsen S.Dotter A.Stello D.2014-07-19T14:04:30Z2014-07-03T10:04:26ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsWe analyze extensive BVR_c_I_c_time-series photometry and radial-velocity measurements for WOCS 40007 (Auner 259; KIC 5113053), a double-lined detached eclipsing binary and a member of the open cluster NGC 6819. Utilizing photometric observations from the 1m telescope at Mount Laguna Observatory and spectra from the WIYN 3.5m telescope, we measure precise and accurate masses (~1.6% uncertainty) and radii (~0.5%) for the binary components. In addition, we discover a third star orbiting the binary with a period greater than 3000days using radial velocities and Kepler eclipse timings. Because the stars in the eclipsing binary are near the cluster turnoff, they are evolving rapidly in size and are sensitive to age. With a metallicity of [Fe/H]=+0.09 +/-0.03, we find the age of NGC 6819 to be about 2.4Gyr from color-magnitude diagram (CMD) isochrone fitting and 3.1+/-0.4Gyr by analyzing the mass-radius (M-R) data for this binary. The M-R age is above previous determinations for this cluster, but consistent within 1{sigma} uncertainties. When the M-R data for the primary star of the additional cluster binary WOCS 23009 is included, the weighted age estimate drops to 2.5+/-0.2Gyr, with a systematic uncertainty of at least 0.2Gyr. The age difference between our CMD and M-R findings may be the result of systematic error in the metallicity or helium abundance used in models, or due to slight radius inflation of one or both stars in the WOCS 40007 binary.2013AJ....146...58Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/146/58CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2010)V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)J/AJ/142/160 : Kepler Mission. II. 2165 eclipsing binaries (Slawson+, 2011)J/ApJ/729/L10 : KIC stars properties in NGC 6791 and NGC 6819 (Basu+, 2011)J/AJ/138/159 : NGC 6819 stellar radial-velocity and photometry (Hole+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/146/58https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/146/58http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/146/58https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/146/58https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/146/58http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/146/58GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/146/58/table5Eclipse timings for WOCS 40007recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date; BJD-2450000dtime.epochdoublee_BJDThe 1{sigma} uncertainty in BJDdstat.errordoubleType[PS] Eclipse type (P=primary, S=secondary)phot.mag;stat.mincharNoteAdditional notes (1)meta.notechar