J/MNRAS/416/817ivo://CDS.VizieR/J/MNRAS/416/817doi:10.26093/cds/vizier.74160817CDSSana H.James G.Gosset E.2024-07-15T20:16:49Z2011-12-27T10:30:38ZCDS support team

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

cds-question@unistra.fropen-star-clustersspectroscopic-binary-starsradial-velocityo-starsUsing an extended set of multi-epoch high resolution high signal-to-noise ratio optical spectra, we re-address the multiplicity properties of the O-type stars in IC 2944 and in the Cen OB2 association. We present new evidence of binarity for five objects and we confirm the multiple nature of another two. We derive the first orbital solutions for HD 100099, HD 101436 and HD 101190 and we provide additional support for HD 101205 being a quadruple system. The minimal spectroscopic binary fraction in our sample is f_min_=0.57. Using numerical simulations, we show that the detection rate of our observational campaign is close to 90%, leaving thus little room for undetected spectroscopic binary systems. The statistical properties of the O-star population in IC 2944 are similar, within the uncertainties, to the results obtained in the earlier papers in this series despite the fact that sample size effects limit the significance of the comparison. Using newly derived spectroscopic parallaxes, we reassess the distance to IC 2944 and obtained 2.3+/-0.3kpc, in agreement with previous studies. We also confirm that, as far as the O stars are concerned, the IC 2944 cluster is most likely a single entity.2011MNRAS.416..817Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/416/817CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/386/447 : RV catalogue of O-type stars in NGC 6231 (Sana+, 2008)J/MNRAS/400/1479 : RV catalogue of O-type stars in NGC 6611 (Sana+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/416/817https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/416/817http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/416/817https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/416/817https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/416/817http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/416/817GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/416/817/stars (Star list)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/416/817/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/416/817/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/416/817/stars?GETtext/xml+votable180.050000true174.86375-63.1852780.0055555555555555566/37896-37897 37900-37901https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/416/817?format=asciiOpticaldefaultJ/MNRAS/416/817/starsStar listrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimaryRAJ2000Simbad Hour of Right Ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Simbad Degree of Declination (J2000.0)pos.eq.dec;meta.mainBmagSimbad B band magnitudemagphot.mag;em.opt.BfloatVmagSimbad V band magnitudemagphot.mag;em.opt.VfloatSpTypeSimbad MK spectral typesrc.spTypecharNote[*] * indicates that values are for the pair, not for individual componentsmeta.notecharSimbadSimbad column added by the CDScharJ/MNRAS/416/817/table2Radial velocity data for O stars in IC2944/Cen OB2NameObject Identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintm_Name[ps] Component (primary/secondary)meta.code.multipcharHJDHeliocentric Julian Datedtime.epochdoubleInstInstrument Setup Code (1)meta.code;instr.setupcharHeI4026? RV measured on HeI4026 (r.w. 4026.072)(2)km/sspect.dopplerVelocfloatnullableu_HeI4026Uncertainty flag on HeI4026meta.code.errorcharSiIV4089? RV measured on SiIV4089 (r.w. 4088.863)(2)km/sspect.dopplerVelocfloatnullableHeI4144? RV measured on HeI4144 (r.w. 4143.759)(2)km/sspect.dopplerVelocfloatnullableu_HeI4144Uncertainty flag on HeI4144meta.code.errorcharHeII4200? RV measured on HeI4388 (r.w. 4199.830)(2)km/sspect.dopplerVelocfloatnullableHeI4388? RV measured on HeI4471 (r.w. 4387.928)(2)km/sspect.dopplerVelocfloatnullableHeI4471? RV measured on MgII4481 (r.w. 4471.512)(2)km/sspect.dopplerVelocfloatnullableMgII4481? RV measured on HeII4542 (r.w. 4481.228)(2)km/sspect.dopplerVelocfloatnullableHeII4542? RV measured on HeII5686 (r.w. 4541.590)(2)km/sspect.dopplerVelocfloatnullableHeII4686? RV measured on HeI4921 (r.w. 4685.682)(2)km/sspect.dopplerVelocfloatnullableHeI4921? RV measured on HeII5412 (r.w. 4921.929)(2)km/sspect.dopplerVelocfloatnullableu_HeI4921Uncertainty flag on HeI4921meta.code.errorcharHeII5412? RV measured on HeI5876 (r.w. 5411.620)(2)km/sspect.dopplerVelocfloatnullableHeI5876? RV measured on HeI7065 (r.w. 5875.620)(2)km/sspect.dopplerVelocfloatnullableu_HeI5876Uncertainty flag on HeI5876meta.code.errorcharHeI7065? RV measured on HeI7065 (r.w. 7065.190)(2)km/sspect.dopplerVelocfloatnullable