J/A+A/423/189ivo://CDS.VizieR/J/A+A/423/189doi:10.26093/cds/vizier.34230189CDSEigenbrod A.Mermilliod J.-C.Claria J.J.Andersen J.Mayor M.2004-09-23T22:30:48Z2004-09-23T22:29:48ZCDS support team

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

cds-question@unistra.fropen-star-clustersgiant-starsradial-velocityvisible-astronomybroad-band-photometryNew, accurate radial velocities and photoelectric UBV photometry of 83 red-giant candidates in the field of the rich, intermediate-age open cluster NGC 2477 ([Fe/H]=-0.05, age ~1Gyr) are presented and discussed. From 49 constant-velocity members we find a mean cluster velocity of +7.32+/-0.13km/s and confirm the membership of 76 of the stars. Among the cluster members, we identify 26 definite and 1 probable spectroscopic binaries and determine orbits for 13 of these systems, with periods ranging from 40 to 4578 days. The binary frequency is thus rather high (27/76=36%). The observed internal radial velocity dispersion of the cluster, as determined from the single member stars, is 0.93km/s, corrected for the small average observational error of 0.22km/s. Fitting King-type models to the observed stellar density distribution and velocity dispersion, and assuming a distance of 1.25kpc, we find the core and tidal radii of NGC 2477 to be 1.8 and 8.1pc, respectively, and estimate that the mass of cluster stars down to V=17, corresponding to ~1M_{sun}_, is at least 5400 M_{sun}_. The substantial differential reddening of NGC 247 requires a more detailed study before definitive isochrone fits can be made.2004A&A...423..189Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/423/189CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch 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 : 10 spectroscopic binaries radial velocities (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+A/375/30 : Radial velocities in open clusters (Mermilliod+, 2001)J/A+A/399/105 : Radial velocities of red giants in NGC 1817 (Mermilliod+ 2003)J/A+AS/134/301 : NGC 2354 red giants (Claria+ 1999)http://obswww.unige.ch/webda/navigation.html : WEBDA databasehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/423/189https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/423/189http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/423/189https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/423/189https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/423/189http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/423/189GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/423/189/table1 (Mean photometric and radial-velocity data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/423/189/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/423/189/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/423/189/table1?GETtext/xml+votable180.050000true118.07880833-38.526763890.0055555555555555566/39350 39353 39356https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/423/189?format=asciiOpticaldefaultJ/A+A/423/189/table1Mean photometric and radial-velocity datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar number (as in WEBDA)meta.id;meta.mainintprimaryHartOriginal identification from Hartwick et al., 1972ApJ...174..557H, Cl* NGC 2477 Hart NNNNNNNmeta.idcharID2? Original identification Hartwick & Hesser, 1974ApJ...192..391H, Cl* NGC 2477 Hart NNNNmeta.idintnullableRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatB-V(B-V) colour indexmagphot.color;em.opt.B;em.opt.VfloatU-B(U-B) colour indexmagphot.color;em.opt.U;em.opt.Bfloato_VmagNumber of UBV measurementsmeta.numberintRVMean radial velocitykm/sphys.veloc;pos.heliocentricfloate_RVError on the radial velocitykm/sstat.errorfloato_RVNumber of RV measurementsmeta.numberintTimeInterval of timedtime.intervalintP(chi2)Probability of variabilitystat.fit.goodness;src.varfloatProbMembership probability from RVstat.fit.goodnessfloatNotesRemarks (NM, SB, SBO)meta.notecharJ/A+A/423/189/table2Radial-velocity datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar number (as in WEBDA)meta.id;meta.mainintHJDHeliocentric Julian Datedtime.epochdoubleHRVHeliocentric Radial velocitykm/sphys.veloc;pos.heliocentricfloate_HRVError on the radial velocitykm/sstat.errorfloat