J/A+A/492/171ivo://CDS.VizieR/J/A+A/492/171doi:10.26093/cds/vizier.34920171CDSGrundahl F.Clausen J.V.Hardis S.Frandsen S.2017-07-11T13:09:22Z2009-01-02T11:42:05ZCDS support team

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

cds-question@unistra.fropen-star-clusterseclipsing-binary-starsphotometryWe wish to determine accurate ages for open clusters and use this, in conjunction with colour-magnitude diagrams, to constrain models of stellar structure and evolution. The detached eclipsing binary V20 in the old, metal-rich ([Fe/H]=+0.40) open cluster NGC6791 is studied in order to determine highly accurate masses and radii of its components. This allows the cluster age to be established with high precision, using isochrones in the mass-radius diagram. Methods. We employ high-resolution UVES spectroscopy of V20 to determine the spectroscopic orbit and time-series V, Ic photometry to obtain the photometric elements.2008A&A...492..171Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/492/171CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/129/2856 : Variable stars in NGC 6791 (Mochejska+, 2005)J/A+A/471/515 : V light curves of NGC 6791 variable stars (De Marchi+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/492/171https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/492/171http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/492/171https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/492/171https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/492/171http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/492/171GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/492/171/obsCombined table from original tablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoublemagJohnson V or Cousins I magnitudemagphot.magfloatBand[VI] Band for magnitudeinstr.bandpasschar