J/MNRAS/385/2210ivo://CDS.VizieR/J/MNRAS/385/2210doi:10.26093/cds/vizier.73852210CDSMaxted P.F.L.Jeffries R.D.Oliveira J.M.Naylor T.Jackson R.J.2024-07-06T20:15:49Z2008-09-25T18:44:46ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsspectroscopic-binary-starsradial-velocityspectroscopyWe have obtained multi-epoch, high-resolution spectroscopy of 218 candidate low-mass stars and brown dwarfs (BDs) in the young clusters around {lambda} Ori and {sigma} Ori. We find that 196 targets are cluster members based on their radial velocity, the equivalent width of their NaI 8200 lines and the spectral type from their TiO band strength. We have identified 11 new binary stars among the cluster members based on their variable radial velocity and an additional binary from the variation in its linewidth and shape. Of these, six are double-lined spectroscopic binaries (SB2) where the components of the binary are of comparable brightness. The others are single-lined binaries (SB1) in which the companion is faint or the spectra of the stars are blended. There are three narrow-lined SB1 binaries in our sample for which the companion is more than 2.5mag fainter than the primary.2008MNRAS.385.2210Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/385/2210CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/356/89 : sigma Ori low-mass stars (Kenyon+, 2005)J/ApJ/610/1064 : Substellar population of young cluster lam Ori (Barrado+ 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/385/2210https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/385/2210http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/385/2210https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/385/2210https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/385/2210http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/385/2210GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/385/2210/table3 (Mean radial velocities and spectral indices)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/385/2210/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/385/2210/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/385/2210/table3?GETtext/xml+votable180.050000true83.98759.7811110.0055555555555555566/22851 22854 22860 23717 23728https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/385/2210?format=asciidefaultJ/MNRAS/385/2210/table3Mean radial velocities and spectral indicesIcmagKron-Cousins I_c_ band magnitudephot.mag;em.opt.Ifloato_<RV>Number of radial velocity measurementsmeta.numberint<RV>Mean radial velocitykm/sspect.dopplerVeloc;stat.meandoublee_<RV>Standard error for <RV>km/sstat.errorfloatlogp? Logarithm of the probability that measured radial velocities are consistent with a constant value (1)stat.fit.goodnessfloatnullableEW(NaI)Equivalent width of the NaI 8200{AA} doublet0.1nmspect.line.eqWidthfloate_EW(NaI)Standard error for EW(NaI)0.1nmstat.errorfloatTiO(8442)Strength of the TiO 8442{AA} featurespect.line.intensityfloate_TiO(8442)Standard error for TiO(8442)stat.errorfloatSB[*] * for SB binarysrc.classchar_RAPosition, derived from its name (right ascension part)degpos.eq.ra;meta.main_DEPosition, derived from its name (declination part)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[MJO2008]Identifier for star, JHHMMSS.s+DDMMSS (G1)meta.id;meta.maincharprimaryJ/MNRAS/385/2210/table2Radial velocity for each star at each epochrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[MJO2008]Identifier for star, JHHMMSS.s+DDMMSS (G1)meta.id;meta.maincharMJDModified heliocentric Julian date of observationdtime.epochdoubleRVMeasured radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_RVStandard error of RVelkm/sstat.errorfloatFWHMFull-width at half-maximum of the cross-correlation functionkm/sspect.line.widthintJ/MNRAS/385/2210/table4Properties of the binaries discovered by our surveyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentifier for star, JHHMMSS.s+DDMMSS (G1)meta.idcharIcmagKron-Cousins I_c_ band magnitudephot.mag;em.opt.IfloatRc-IcCousins R-I colour indexmagphot.color;em.opt.R;em.opt.Ifloato_<RV>Number of radial velocity measurementsmeta.numberint<RV>Mean radial velocitykm/sspect.dopplerVeloc;stat.meanfloate_<RV>Standard error for <RV>km/sstat.errorfloatlogp? Logarithm of the probability that measured radial velocities are consistent with a constant value (1)stat.fit.goodnessfloatnullableEW(NaI)Equivalent width of the NaI 8200{AA} doublet0.1nmspect.line.eqWidthfloate_EW(NaI)Standard error for EW(NaI)0.1nmstat.errorfloatTiO(8442)Strength of the TiO 8442{AA} featurespect.line.intensityfloate_TiO(8442)Standard error for TiO(8442)stat.errorfloatTypeSB typesrc.classcharMm[nm] nm for non-membermeta.code.membercharn_[MJO2008][ab] Note on cross-correlation function (2)meta.notechar[MJO2008]Name as in tables 2 and 3meta.id;meta.maincharf_[MJO2008][*] * when [MJO2008] differs from Namemeta.codechar