J/MNRAS/386/447ivo://CDS.VizieR/J/MNRAS/386/447doi:10.26093/cds/vizier.73860447CDSSana H.Gosset E.Naze Y.Rauw G.Linder N.2024-07-06T20:16:10Z2008-07-09T09:37:56ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsradial-velocityo-starsWe present the results of a long-term high-resolution spectroscopy campaign on the O-type stars in NGC 6231. We revise the spectral classification and multiplicity of these objects and we constrain the fundamental properties of the O-star population. Almost three quarters of the O-type stars in the cluster are members of a binary system. The minimum binary fraction is 0.63, with half the O-type binaries having an orbital period of the order of a few days. The eccentricities of all the short-period binaries are revised downward, and henceforth match a normal period-eccentricity distribution. The mass-ratio distribution shows a large preference for O+OB binaries, ruling out the possibility that, in NGC 6231, the companion of an O-type star is randomly drawn from a standard IMF. Obtained from a complete and homogeneous population of O-type stars, our conclusions provide interesting observational constraints to be confronted with the formation and early-evolution theories of O stars.2008MNRAS.386..447Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/386/447CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/315/384 : Binarity among B-stars in NGC 6231 (Raboud, 1996)J/A+A/325/167 : Geneva photometry in NGC 6231 (Raboud+ 1997)J/AJ/115/734 : NGC 6231 UBVRI and H{alpha} photometry (Sung+ 1998)J/A+AS/137/233 : UBVI imaging photometry of NGC 6231 (Baume+, 1999)J/A+A/454/1047 : XMM view of NGC 6231 open cluster (Sana+, 2006)J/MNRAS/372/661 : XMM view of NGC 6231: OB stars (Sana+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/386/447https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/386/447http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/386/447https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/386/447https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/386/447http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/386/447GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/386/447/table3m (Mean radial velocities)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/386/447/table3m?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/386/447/table3m?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/386/447/table3m?GETtext/xml+votable180.050000true253.4651083-41.8423750.0055555555555555566/42394https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/386/447?format=asciiOpticaldefaultJ/MNRAS/386/447/table3mMean radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject Identifiermeta.id;meta.maincharprimarym_Name[ps] p for primary, s for secondarymeta.code.multipcharHeI4026? Mean radial velocity measured on HeI4026 (r.w. 4026.072) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HeI4026? 1 sigma dispersion of HeI4026 mean velocitykm/sstat.errorfloatnullableSiIV4089? Mean radial velocity measured on SiIV4089 (r.w. 4088.863) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_SiIV4089? 1 sigma dispersion of SiIV4089 mean velocitykm/sstat.errorfloatnullableHeI4144? Mean radial velocity measured on HeI4144 (r.w. 4143.759) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HeI4144? 1 sigma dispersion of HeI4144 mean velocitykm/sstat.errorfloatnullableHeI4388? Mean radial velocity measured on HeI4388 (r.w. 4387.928) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HeI4388? 1 sigma dispersion of HeI4388 mean velocitykm/sstat.errorfloatnullableHeI4471? Mean radial velocity measured on HeI4471 (r.w. 4471.512) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HeI4471? 1 sigma dispersion of HeI4471 mean velocitykm/sstat.errorfloatnullableMgII4481? Mean radial velocity measured on MgII4481 (r.w. 4481.228) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_MgII4481? 1 sigma dispersion of MgII4481 mean velocitykm/sstat.errorfloatnullableHeII4542? Mean radial velocity measured on HeII4542 (r.w. 4541.590) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HeII4542? 1 sigma dispersion of HeII4542 mean velocitykm/sstat.errorfloatnullableHeII4686? Mean radial velocity measured on HeII5686 (r.w. 4685.682) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HeII4686? 1 sigma dispersion of HeII5686 mean velocitykm/sstat.errorfloatnullableHeI4921? Mean radial velocity measured on HeI4921 (r.w. 4921.929) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HeI4921? 1 sigma dispersion of HeI4921 mean velocitykm/sstat.errorfloatnullableHeI5876? Mean radial velocity measured on HeI5876 (r.w. 5875.620) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HeI5876? 1 sigma dispersion of HeI5876 mean velocitykm/sstat.errorfloatnullableHeI7065? Mean radial velocity measured on HeI7065 (r.w. 7065.190) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HeI7065? 1 sigma dispersion of HeI7065 mean velocitykm/sstat.errorfloatnullableMeanRV? Mean radial velocity computed of the measured lines (G3)km/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_MeanRV? rms uncertainty on Mean (G3)km/sstat.errorfloatnullableSigmaRV? 1 sigma dispersion of the measured RVs (G3)km/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_SigmaRV? rms uncertainty on Sigma (G3)km/sstat.errorfloatnullableSimbadSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/386/447/table3dRadial velocity data for O stars in NGC 6231recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject Identifiermeta.id;meta.maincharn_Name[ps] p for primary, s for secondarymeta.notecharHJDHeliocentric Julian Datedtime.epochdoubleInst[abcd] Instrument Setup Code (1)meta.code;instr.setupcharHeI4026? Radial velocity measured on HeI4026 (r.w. 4026.072) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullableSiIV4089? Radial velocity measured on SiIV4089 (r.w. 4088.863) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullableHeI4144? Radial velocity measured on HeI4144 (r.w. 4143.759) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullableHeI4388? Radial velocity measured on HeI4388 (r.w. 4387.928) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullableHeI4471? Radial velocity measured on HeI4471 (r.w. 4471.512) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullableMgII4481? Radial velocity measured on MgII4481 (r.w. 4481.228) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullableHeII4542? Radial velocity measured on HeII4542 (r.w. 4541.590) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullableHeII4686? Radial velocity measured on HeII5686 (r.w. 4685.682) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullableHeI4921? Radial velocity measured on HeI4921 (r.w. 4921.929) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullableHeI5876? Radial velocity measured on HeI5876 (r.w. 5875.620) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullableHeI7065? Radial velocity measured on HeI7065 (r.w. 7065.190) (G2)km/sspect.dopplerVeloc;pos.heliocentricfloatnullableMeanRVMean RV computed of the measured lines for a given HJD (G3)km/sfloatSigmaRV? 1 sigma dispersion of the measured RVs on a given HJD (G3)km/sspect.dopplerVeloc;pos.heliocentricfloatnullable