J/A+A/375/30ivo://CDS.VizieR/J/A+A/375/30doi:10.26093/cds/vizier.33750030CDSMermilliod J.-C.Claria J.J.Andersen J.Piatti A.E.Mayor M.2018-01-10T11:47:17Z2001-08-12T16:28:45ZCDS support team

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

cds-question@unistra.fropen-star-clustersgiant-starsradial-velocityWe present accurate radial velocities and photoelectric UBV photometry for 73 and 57 red-giant candidates, respectively, in the intermediate-age open clusters NGC 2324, 2818, 3960 and 6259. These data confirm the membership of 47 stars, 12 of which (26% ) are spectroscopic binaries; three preliminary orbits have been determined in NGC 3960. From Washington photometry of 8 red giant members, the metallicity of NGC 6259 is found to be [Fe/H]=0.06+/-0.08. At the age of these clusters, most of the red giants are observed in the core-helium (clump) burning phase, the general morphology of which is well reproduced by theoretical models with convective overshooting. However, a number of bona fide cluster giant members are found significantly to the red of the isochrones fitting the rest of the CMD of these and a few other clusters. Some of these stars are binaries, but others seem to be single. In either case, their red colours and/or low luminosities remain unexplained by current stellar evolution theory.2001A&A...375...30Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/375/30CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/299/53 : Red giants in NGC 3680 and IC 4651 (Mermilliod+, 1995)J/A+A/307/80 : Velocities of red giants in NGC 2099 (Mermilliod+ 1996)J/A+A/319/481 : Radial velocities of 10 spect. binaries (Mermilliod+ 1997)J/A+A/324/91 : Melotte 71 red giants radial velocities (Mermilliod+ 1997)J/A+A/339/423 : Velocities of red giants in NGC 752 (Mermilliod+ 1998)J/A+AS/134/301 : NGC 2354 red giants (Claria+ 1999)J/A+A/423/189 : NGC 2477 red giants UBV phot. & RV (Eigenbrod+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/375/30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/375/30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/375/30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/375/30https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/375/30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/375/30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/375/30/table1CORAVEL radial-velocity dataClusterCluster namemeta.id.parentcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSimbadSimbad column added by the CDSmeta.refcharStarStar number (1)meta.idintHJDHeliocentric Julian Datedtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloate_RVError on the radial velocitykm/sstat.errorfloat