J/A+A/315/384ivo://CDS.VizieR/J/A+A/315/384doi:10.26093/cds/vizier.33150384CDSRaboud D.1997-12-09T16:47:05Z1997-12-09T17:47:01ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsradial-velocityWe have measured radial velocities for 53 B-type stars, between B1 and B9, in the young open cluster NGC 6231 through a cross-correlation technique with synthetic spectra. Two measurements for 36 stars of the sample were obtained with a time separation of about two years. We derived a minimum binary fraction of 52% in the considered population. The velocity determination precisions were simulated and we analysed their dependence upon the S/N ratios of the spectra and upon the stellar rotational velocities. We discuss the selection of the templates for the correlation.1996A&A...315..384Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/315/384CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/315/384https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/315/384http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/315/384https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/315/384https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/315/384http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/315/384GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/315/384/table3Results for all programme starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNumber[]? Star number from Seggewiss (1968VeBon..79....1S)meta.idintVmag[]? V magnitudemagphot.mag;em.opt.Vfloat[B-V][]? Color indexmagphot.color;em.opt.B;em.opt.VfloatTeff[]? Effective temperature calculated (1)Kphys.temperature.effectiveintn_TeffRemark on Teff determination (2)meta.notecharVsini[]? Rough determination of Vsini (3)km/sphys.veloc.rotatintr_TeffSource of the photometry and Teff (4)meta.refcharJDJulian Date of the observationtime.epochdoubleRV[]? Radial velocitieskm/sphys.veloc;pos.heliocentricfloatn_RVSBII characteristic of the star (5)meta.notechare_RV[]? Radial velocity uncertainties (6)km/sstat.errorfloatRVdiff1[]? Radial velocity differences (7)km/sphys.veloc;arith.difffloatRVdiff2[]? Radial velocity differences (7)km/sphys.veloc;arith.difffloatRVdiff3[]? Radial velocity differences (8)km/sphys.veloc;arith.difffloatRVdiff4[]? Radial velocity differences (8)km/sphys.veloc;arith.difffloat