J/AJ/159/15ivo://CDS.VizieR/J/AJ/159/15doi:10.26093/cds/vizier.51590015CDSTokovinin A.Briceno C.2020-02-27T07:35:44Z2020-02-27T08:02:31ZCDS support team

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

cds-question@unistra.frstar-forming-regionsmultiple-starsvisible-astronomytrigonometric-parallaxproper-motionsapparent-magnitudestellar-massesTo address the statistics of binary stars in the 8 Myr old Upper Scorpius (USco) star formation region, we conducted a speckle interferometric survey of 614 association members more massive than 0.4 M_{sun}_ (spectral types earlier than M3V) based on the list of Luhman et al. (2018, J/AJ/156/271). We resolved 187 pairs, 55 of which are new discoveries. Also using the published data and the Gaia DR2 (Cat. I/345), a catalog of 250 physical binaries was produced. We carefully estimated detection limits for each target and studied binary statistics in the separation range from 0.06" to 20" (9-2800 au), as well as clustering at larger separations. The frequency of companions with mass ratios q>0.3 in this separation range is 0.33+/-0.04 and 0.35+/-0.04 for early M- and solar-type stars, respectively, larger by 1.62+/-0.22 and 1.39+/-0.18 times compared to field stars of similar masses. The excess is produced mostly by pairs closer than 100 au. At separations from 100 to 10^4^ au, the separation distribution and companion fraction resemble those of solar-type stars in the field. However, unlike in the field, we see a relative deficit of equal-mass binaries at separations of ~500 au, compared to smaller and larger separations. The distribution of q depends on the separation, with a preference of larger q and a larger fraction of twins with q>0.95 at smaller separations. The binary population of USco differs from binaries in the field in several ways and suggests that binary statistics is not universal.2020AJ....159...15Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/159/15CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014)I/345 : Gaia DR2 (Gaia, 2018)J/A+A/356/541 : T Tauri stars in the Sco-Cen OB association (Koehler+, 2000)J/A+A/430/137 : Close visual companions in Scorpius OB2 (Kouwenhoven+, 2005)J/ApJS/181/62 : Survey of young solar analogs (Metchev+, 2009)J/ApJ/757/141 : Companion IR detection limits in young associationsJ/ApJ/785/47 : Sources around target stars in Upper ScorpiusJ/AJ/155/196 : Analysis of K2 LCs for members of USco & {rho} OphJ/AJ/156/75 : Circumstellar disks in the Upper Sco associationJ/AJ/156/76 : New young stars and brown dwarfs in Upper Sco (Luhman+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/159/15https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/159/15http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/159/15https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/159/15https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/159/15http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/159/15GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/159/15/table1 (Filtered Luhman's sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/159/15/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/159/15/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/159/15/table1?GETtext/xml+votable180.050000true233.04305-21.96680.0055555555555555564/2769 2772 5/10727 10735 10736 10737 10739 10744 10746 10747 10750 11075 11092 11094 11097 11100 6/29320 29348 29353 29358 30721 30722 30726 30728 42799 42808 42851 42854 42857 42858 42859 42860 42873 42876 42900 42903 42906 42907 42913 42916 42917 42921 42923 42924 42925 42930 42932 42933 42935 42939 42952 42953 42955 42968 42972 42980 42981 42982 42995 42997 42998 42999 43004 44119 44288 44289 44293 44297 44321 44324 44333 44337 44341 44343 44348 44372 44374 44382 44385 44386 44387 44393 44396 44397 44404 44408 44409 44421 44436 44480 44481 44483 445021.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/159/15?format=asciiOpticaldefaultJ/AJ/159/15/table1Filtered Luhman's sampleDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintUSnNumber in Esplin et al. (2018, J/AJ/156/75)meta.idcharprimarymoreindicates data for this source in other tablesmeta.ref.urlcharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainPlx[5.12/11.04]? Parallax from Gaia DR2 (Cat. I/345)maspos.parallaxfloatnullablepmRA[-24.6/3.77]? Proper motion in RA (pmRA*cosDE)mas/yrpos.pm;pos.eq.rafloatnullablepmDE[-41.1/-11.33]? Proper motion in DEmas/yrpos.pm;pos.eq.decfloatnullableVmag[2.3/17.16] V-band magnitudemagphot.mag;em.opt.VfloatGmag[2.27/15.16] Gaia DR2 G-band magnitudemagphot.mag;em.optfloatV-K[-0.76/7.26] V-K color indexmagphot.color;em.opt.V;em.IR.KfloatAv[0/0.29] Extinction from Esplin et al. (2018, J/AJ/156/75)magphys.absorptionfloatMstar[0.32/16.29] Estimated masssolMassphys.massfloatFsec[0/1] Flag for secondary component (0=Primary; 1=Secondary)meta.codeintJ/AJ/159/15/table2Results of SOAR observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDSWDS code (HHMMm+DDMM, J2000) (G1)meta.id;meta.maincharUSnNumber in Esplin et al. (2018, J/AJ/156/75)meta.idcharDiscDiscoverer designation from WDS or from USn numbermeta.idcharCompComponents designationmeta.code.multipcharEpoch[2008.535/2019.613] Epoch of observation, Julian yearyrtime.epochdoubleFilt[Iy] Filter usedinstr.setup;instr.filtercharPA[-0/358.9]? Position angle (1)degpos.posAngfloatnullableSep[0/5.462]? Separation (1)arcsecpos.angDistancefloatnullablee_Sep[0.1/781.8]? The 1{sigma} uncertainty in Sep (1)masstat.errorfloatnullableDm[-0.17/7.45]? Magnitude difference of pair (1)magphot.mag;arith.difffloatnullableMinSep[0.028/0.767] Minimum detectable resolution limitarcsecpos.angResolutionfloatDm0.15[0/5.44] 5{sigma} magnitude difference at 0.15 arcsecondmagphot.mag;arith.difffloatDm1[0/6.91] 5{sigma} magnitude difference at 1 arcsecondmagphot.mag;arith.difffloatJ/AJ/159/15/table3Detection limitsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintUSnNumber in Esplin et al. (2018, J/AJ/156/75)meta.idcharRefReference (1)meta.ref;pos.framecharMethMethod (2)meta.codecharlambda[0.5/2.2] Imaging wavelength {lambda}umem.wlfloatSep1[0.031/7.143] Minimum separation, first valuearcsecpos.angDistance;stat.minfloatSep2[0.046/28.436] Minimum separation, second valuearcsecpos.angDistance;stat.minfloatSep3[0.062/28.436] Minimum separation, third valuearcsecpos.angDistancefloatSep4[0.2/28.436] Minimum separation, forth valuearcsecpos.angDistancefloatSep5[1/28.436] Minimum separation, fifth valuearcsecpos.angDistancefloatSep6[1.523/28.436] Minimum separation, sixth valuearcsecpos.angDistancefloatDm1[0/13.5] Maximum magnitude difference at Sep1magphot.mag;arith.difffloatDm2[0.02/18.5] Maximum magnitude difference at Sep2magphot.mag;arith.difffloatDm3[0.02/20.3] Maximum magnitude difference at Sep3magphot.mag;arith.difffloatDm4[0.02/20.7] Maximum magnitude difference at Sep4magphot.mag;arith.difffloatDm5[0.02/20.7] Maximum magnitude difference at Sep5magphot.mag;arith.difffloatDm6[0.02/20.7] Maximum magnitude difference at Sep6magphot.mag;arith.difffloatJ/AJ/159/15/table5List of binaries in Upper ScorpiusM1[0.19/16.29] Primary masssolMassphys.massfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDSWDS code (HHMMm+DDMM, J2000) (G1)meta.id;meta.maincharUSnNumber in Esplin et al. (2018, J/AJ/156/75)meta.idcharDiscDiscoverer designationmeta.idcharCompComponents designationmeta.code.multipcharEpoch[2000.4/2019.61] Epoch of observation, Julian yearyrtime.epochfloatPA[1.2/359.9] Position angledegpos.posAngfloatSep[0.017/20.128] Separationarcsecpos.angDistancefloatDm[0/11.66] Magnitude difference of pair at {lambda} (1)magphot.mag;arith.difffloatlambda[0.5/2.2] Imaging wavelength {lambda}umem.wlfloatq[-0.02/1] Mass ratiophys.massfloatLev[1/12] Hierarchical level (2)meta.codeint