J/ApJ/703/1511ivo://CDS.VizieR/J/ApJ/703/1511doi:10.26093/cds/vizier.17031511CDSKraus A.L.Hillenbrand L.A.2017-06-28T06:58:32Z2011-11-23T07:56:56ZCDS support team

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

cds-question@unistra.frmultiple-starsstellar-spectral-typesstellar-massesspectroscopyproper-motionsWe describe an astrometric and spectroscopic campaign to confirm the youth and association of a complete sample of candidate wide companions in Taurus and Upper Sco. Our survey found 15 new binary systems (three in Taurus and 12 in Upper Sco) with separations of 3"-30" (500-5000AU) among all of the known members with masses of 2.5-0.012M_{sun}_. The total sample of 49 wide systems in these two regions conforms to only some expectations from field multiplicity surveys. Higher mass stars have a higher frequency of wide binary companions, and there is a marked paucity of wide binary systems near the substellar regime. However, the separation distribution appears to be log-flat, rather than declining as in the field, and the mass ratio distribution is more biased toward similar-mass companions than the initial mass function or the field G-dwarf distribution. The maximum separation also shows no evidence of a limit at <~5000AU until the abrupt cessation of any wide binary formation at system masses of ~0.3M_{sun}_. We attribute this result to the post-natal dynamical sculpting that occurs for most field systems; our binary systems will escape to the field intact, but most field stars are formed in denser clusters and undergo significant dynamical evolution. In summary, only wide binary systems with total masses <~0.3M_{sun}_ appear to be "unusually wide."2009ApJ...703.1511Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/703/1511CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/527/A24 : Spectra of low-mass stars in Upper Sco (Lodieu+, 2011)J/PASJ/60/209 : Faint companions around YSOs in TMC (Itoh+, 2008)J/ApJ/662/413 : 2MASS survey of wide multiplicity in 3 associations (Kraus+,J/AJ/131/3016 : Low-mass objects in Upper Scorpius (Slesnick+, 2006)J/ApJ/645/676 : Spatial distribution of brown dwarfs in Taurus (Luhman+, 2006)J/AJ/129/2294 : Radial velocities of T Tauri stars (Massarotti+, 2005)J/AJ/124/404 : Upper Scorpius OB association Lithium survey. II. (Preibisch,J/AJ/120/479 : Low-mass stars in the Upper Sco association (Ardila+, 2000)J/A+A/356/541 : T Tauri stars in the Sco-Cen OB association (Koehler+, 2000)J/A+A/325/647 : High-resolution spectra south of Taurus (Neuhaeuser+ 1997)J/ApJS/101/117 : UBVRIJHKLMNQ photometry in Taurus-Auriga (Kenyon+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/703/1511https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/703/1511http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/703/1511https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/703/1511https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/703/1511http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/703/1511GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/703/1511/wide_bin (Candidate wide companions in Taurus and Upper Sco)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/703/1511/wide_bin?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/703/1511/wide_bin?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/703/1511/wide_bin?GETtext/xml+votable180.050000true70.43707523.03094170.005555555555555556Cone search capability for table J/ApJ/703/1511/table9 (Binary properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/703/1511/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/703/1511/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/703/1511/table9?GETtext/xml+votable180.050000true73.948220830.46881390.0055555555555555566/478 1029 1031 1037 1040 1048 1050 1052 1053 1054 1073 1074 1075 1080 1082 1114 1159 1164 1168 1170 1199 23548 23549 23551 42941 42982 42985 42986 42988 42989 44297 44307 44310 44311 44316 44317 44361 44365 44367 44378 44379 44389 44400https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/703/1511?format=asciiOpticaldefaultJ/ApJ/703/1511/wide_binCandidate wide companions in Taurus and Upper ScorecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCloudCloud name ("Taurus" or "Upper Sco")meta.id.parentcharNameKnown member name (G1)meta.maincharprimaryCompCandidate companion name (G1)meta.id.assoccharSepSeparation between the two objectsarcsecpos.angDistancefloatPAPosition angledegpos.posAngfloatDelKObserved flux ratio {Delta}Kmagphot.flux;arith.ratiofloatSpTypeKnown MK spectral type (G2)src.spTypecharRefReference (see refs.dat file)meta.ref;pos.frameintMKSpectral types from B. Skiff's catalog B/mk, if any match within 30"src.spTypeintnullableSimbadNameSimbad column added by the CDSmeta.idcharSet{Delta}K <3 or >3meta.idcharSp[YN? ] Membership spectroscopic determinationmeta.code.membercharAs[YN? ] Membership astrometric determinationmeta.code.membercharF[YN] Membership final determinationmeta.code.membercharl_SpT[~< ] Limit flag on SpTmeta.code.errorcharSpTMK spectral typesrc.spTypecharW(Ha)? H{alpha} equivalent width0.1nmspect.line.eqWidth;em.line.Halphafloatnullable_RAPositions from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad (declination part)degpos.eq.dec;meta.mainJ/ApJ/703/1511/table6Astrometric dataPAPosition angledegpos.posAngfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDTypeData type (New or Archival)meta.codecharNameKnown member identificationmeta.code.membercharCompCandidate companion identificationmeta.id.assoccharEpochEpoch of observation; JD-2400000dtime.epochintSepSeparationmaspos.angDistanceinte_SepUncertainty in Sepmasstat.errorinte_PAUncertainty in PAdegstat.errorfloatSourceSourcemeta.bibcharJ/ApJ/703/1511/table7Companion kinematicsmudRelative proper motion in DE (1)mas/yrpos.pm;pos.eq.decfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameKnown member namemeta.code.membercharCompCandidate companion namemeta.id.assoccharmuaRelative proper motion in RA (1)mas/yrpos.pm;pos.eq.rafloate_mu1{sigma} error on relative proper motion (1)mas/yrstat.errorfloatJ/ApJ/703/1511/table9Binary propertiesSetKnown or Newmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNamePrimary namemeta.id;meta.maincharf_Name[b] Secondary more massive (1)meta.codecharCompSecondary namemeta.id.assoccharM1aPrimary mass of component 1 (2)solMassphys.massfloatM1b? Primary mass of component 2 (2)solMassphys.massfloatnullablef_M1b[w] Sources without spectral types (3)meta.codecharM1c? Primary mass of component 3 (2)solMassphys.massfloatnullablef_M1c[w] Sources without spectral types (3)meta.codecharM1d? Primary mass of component 4 (2)solMassphys.massfloatnullablef_M1d[w] Sources without spectral types (3)meta.codecharM2aSecondary mass of component 1 (2)solMassphys.massfloatf_M2a[w] Sources without spectral types (3)meta.codecharM2b? Secondary mass of component 2 (2)solMassphys.massfloatnullablef_M2b[w] Sources without spectral types (3)meta.codecharqMs/Mp mass ratio (4)phys.massfloatrSeparation in AUAUpos.angDistanceintSimbadNameSimbad column added by the CDSmeta.idchar_RAPositions from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad (declination part)degpos.eq.dec;meta.mainJ/ApJ/703/1511/table3Previously confirmed field starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCloudCloud name ("Taurus" or "Upper Sco")meta.id;meta.maincharNamePrimary namemeta.idcharCompSecondary namemeta.id.assoccharSepSeparation between the two objectsarcsecpos.angDistancefloatPAPosition angledegpos.posAngfloatDelKObserved flux ratio {Delta}Kmagphot.flux;arith.ratiofloatSpT1Primary MK spectral type (G2)src.spTypecharSpT2Secondary MK spectral type (G2)src.spTypecharRefReference(s)meta.ref;pos.framecharJ/ApJ/703/1511/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintprimaryBibCodeBibcodemeta.bib.bibcodecharAutAuthor's name(s)meta.bib.authorcharCommCommentmeta.notechar