J/A+A/488/167ivo://CDS.VizieR/J/A+A/488/167doi:10.26093/cds/vizier.34880167CDSSacco G.G.Franciosini E.Randich S.Pallavicini R.2017-06-27T06:38:05Z2008-11-22T11:31:03ZCDS support team

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

cds-question@unistra.fropen-star-clusterslate-type-starsinfrared-photometryspectroscopyWe performed a detailed membership selection and studied the accretion properties of low-mass stars in the two apparently very similar young (1-10Myr) clusters {sigma} Ori and {lambda} Ori. We observed 98 and 49 low-mass (0.2-1.0M_{sun}_stars in {sigma} Ori and {lambda} Ori respectively, using the multi-object optical spectrograph FLAMES at the VLT, with the high-resolution (R~17000) HR15N grating (6470-6790{AA}). We used radial velocities, Li and H{alpha} to establish cluster membership and H{alpha} and other optical emission lines to analyze the accretion properties of members. We identified 65 and 45 members of the {sigma} Ori and {lambda} Ori clusters, respectively, and discovered 16 new candidate binary systems.2008A&A...488..167Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/488/167CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/419/249 : RJHKs photometry of sigma Ori low-mass stars (Scholz+, 2004)J/AJ/128/2316 : BVRIJHKs photometry in sigma Ori cluster (Sherry+, 2004)J/AN/325/705 : RIJHKs of low-mass stars in sigma Ori (Bejar+, 2004)J/MNRAS/356/89 : sigma Ori low-mass stars (Kenyon+, 2005)J/MNRAS/356/1583 : RV of Sigma Ori low-mass cand. members (Burningham+, 2005)J/AJ/118/2409 : VRI photometry of lambda Ori PMS stars (Dolan+, 1999)J/ApJ/610/1064 : Substellar pop. of lambda Ori (Barrado y Navascues+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/488/167https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/488/167http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/488/167https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/488/167https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/488/167http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/488/167GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/488/167/obs (Photometry and membership for the observed sample stars in {sigma} and {lambda} Ori clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/488/167/obs?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/488/167/obs?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/488/167/obs?GETtext/xml+votable180.050000true84.6449583-2.65833330.0055555555555555566/22851 22854 23717 237281.5062136169708525e-19 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/488/167?format=asciiOpticalInfrareddefaultJ/A+A/488/167/obsPhotometry and membership for the observed sample stars in {sigma} and {lambda} Ori clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[SFR2008]Object identification (G1)meta.id;meta.maincharprimaryASimbad column added by the CDSmeta.ref.urlcharVSimbad column added by the CDSphys.veloccharplPlot the velocities measuredmeta.ref.urlcharNameName (1)meta.idcharRAJ2000Right ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (2)pos.eq.dec;meta.mainImag? I magnitudemagphot.mag;em.opt.IfloatnullableR-I? R-I colour indexmagphot.color;em.opt.R;em.opt.Ifloatnullabler_R-I[1/5]? I,R photometry reference (3)meta.ref;phot.color;em.opt.RintnullableJmag? 2MASS J magnitudemagphot.mag;em.IR.JfloatnullableH-Ks? 2MASS H-Ks colour indexmagphot.color;em.IR.H;em.IR.KfloatnullableSpTMK spectral typesrc.spTypecharn_SpT[*] * for spectroscopic spectral type (4)meta.notecharRV? Mean radial velocitykm/sspect.dopplerVeloc;stat.meanfloatnullablee_RV? rms uncertainty on RVkm/sstat.errorfloatnullablel_vsiniLimit flag on vsinimeta.code.error;phys.veloc.rotatcharvsini? Rotational velocitykm/sphys.veloc.rotatfloatnullableE_vsini? Error on vsini (upper limit)km/sstat.error;stat.maxfloatnullablee_vsini? Error on vsini (lower limit)km/sstat.error;phys.veloc.rotatfloatnullableEW(Li)? Li pseudo-equivalent width (G2)0.1nmspect.line.widthintnullablee_EW(Li)? rms uncertainty on EW(Li)0.1nmstat.errorintnullablen_EW(Li)[Y/N] For double-lined spectroscopic binary (5)meta.notecharMVt[Y?N] Membership from tangential velocitymeta.code.membercharMLi[Y?N] Membership from Li measurementsmeta.code.membercharMHa[YN? ] Membership from H{alpha} measurementsmeta.code.membercharMmb[YN? ] Final membershipmeta.code.member;phys.atmol.finalcharX[YN-] Detection line flag in XMM field (Yes, No or outside XMM field)meta.code.error;obs.fieldcharNotesNotesmeta.notecharSimbadNameSimbad column added by the CDSmeta.idcharJ/A+A/488/167/accretAccretion properties of {sigma} and {lambda} Ori clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[SFR2008]Object identification (G1)meta.id;meta.maincharw(Ha)? H{alpha} pseudo-equivalent width (G2)0.1nmspect.line.eqWidthfloatnullablee_w(Ha)? rms uncertainty on w(Ha)0.1nmstat.errorfloatnullableW10(Ha)? H{alpha} width at 10% of the peakkm/sspect.line.widthintnullablee_W10(Ha)? rms uncertainty on W10(Ha)km/sstat.errorintnullablel_logdM/dtLimit flag on logdM/dtmeta.code.errorcharlogdM/dt? Accretion mass losslog(solMass.yr**-1)phys.mass.lossfloatnullablee_logdM/dt? rms uncertainty on dM/dtlog(solMass.yr**-1)stat.errorfloatnullablel_w(NII)[<~ ] Limit flag on w(NII)meta.code.errorcharw(NII)? NII6583 pseudo-equivalent width (G2)0.1nmspect.line.eqWidthfloatnullablel_w(HeI)[<~ ] Limit flag on w(HeI)meta.code.errorcharw(HeI)? HeI6678 pseudo-equivalent width (G2)0.1nmspect.line.eqWidthfloatnullablel_w(SII1)[<~ ] Limit flag on w(SII1)meta.code.errorcharw(SII1)? SII6716 pseudo-equivalent width (G2)0.1nmspect.line.eqWidthfloatnullablew(SII1)b? Second SII6716 pseudo-equivalent width (G2)0.1nmspect.line.eqWidthfloatnullablen_w(SII1)b[b] b: split in two separate linesmeta.notecharl_w(SII2)[<~ ] Limit flag on w(SII2)meta.code.errorcharw(SII2)? SII6731 pseudo-equivalent width (G2)0.1nmspect.line.eqWidthfloatnullablew(SII2)b? Second SII6731 pseudo-equivalent width (G2)0.1nmspect.line.eqWidthfloatnullablen_w(SII2)b[b] b: split in two separate linesmeta.notecharDiskDisk class (2)meta.code.classcharn_Disk[dc] Note on Disk class (3)meta.notecharJ/A+A/488/167/rvRadial velocities of the candidate binary systems identified in {sigma} and {lambda} Ori cluster samples (table 6 and 7 of the paper)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[SFR2008]Object identification (G1)meta.id;meta.maincharm_[SFR2008][ab] Multiplicity index on [SFR2008]meta.code.multipcharHJDHeliocentric Julian datedtime.epochdoubleRVRadial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_RVrms uncertainty on RVkm/sstat.errorfloat