J/A+A/580/A88ivo://CDS.VizieR/J/A+A/580/A88doi:10.26093/cds/vizier.35800088CDSElliott P.Huelamo N.Bouy H.Bayo A.Melo C.H.F.Torres C.A.O.,Sterzik M.F.Quast G.R.Chauvin G.Barrado D.2017-12-15T10:55:39Z2015-08-07T09:42:12ZCDS support team

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

cds-question@unistra.frmultiple-starsyoung-stellar-objectsYoung loose nearby associations are unique samples of close (<150pc), young (~5-100Myr) pre-main sequence (PMS) stars. A significant number of members of these associations have been identified in the SACY collaboration. We can use the proximity and youth of these members to investigate key ingredients in star formation processes, such as multiplicity. We present the statistics of identified multiple systems from 113 confirmed SACY members. We derive multiplicity frequencies, mass-ratio, and physical separation distributions in a consistent parameter space, and compare our results to other PMS populations and the field. We have obtained adaptive-optics assisted near-infrared observations with NACO (ESO/VLT) and IRCAL (Lick Observatory) for at least one epoch of all 113 SACY members. We have identified multiple systems using co-moving proper-motion analysis and using contamination estimates. We have explored ranges in projected separation and mass-ratio of a [3-1000AU], and q [0.1-1], respectively. We have identified 31 multiple systems (28 binaries and 3 triples). We derive a multiplicity frequency (MF) of MF_3-1000AU_=28.4^+4.7^_-3.9_% and a triple frequency (TF) of TF_3-1000AU_=2.8^+2.5^_-0.8_% in the separation range of 3-1000AU. We do not find any evidence for an increase in the MF with primary mass. The estimated mass-ratio of our statistical sample (with power-law index {gamma}=-0.04+/-0.14) is consistent with a flat distribution ({gamma}=0).2015A&A...580A..88Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/580/A88CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/460/695 : Search for Associations Containing Young starsJ/A+A/508/833 : SACY III. Li abundances (da Silva+, 2009)J/MNRAS/431/1005 : SACY IV. IC 2391 and Argus young stars (de Silva+, 2013)J/A+A/568/A26 : SACY V. Multiple systems (Elliott+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/580/A88https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/580/A88http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/580/A88https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/580/A88https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/580/A88http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/580/A88GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/580/A88/tablea1 (All targets analysed in this work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/580/A88/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/580/A88/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/580/A88/tablea1?GETtext/xml+votable180.050000true4.58708330.9561110.005555555555555556Cone search capability for table J/A+A/580/A88/tableb1 (Photometry and parameters from individual observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/580/A88/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/580/A88/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/580/A88/tableb1?GETtext/xml+votable180.050000true314.529925-9.03514720.0055555555555555566/10203 12337 12436 12770 13512 13674 15686 16426 16930 17288 18092 18686 18745 18769 18802 18838 18870 18927 18933 18967 19067 19163-19164 19276 19308 19459 19540 19554 20327 20528 20564 20639 20650 21070 21145 21418 21763 22581 23028 23068 23136 23272 23321 23388 23395 26133 28746 28849 29187 29288 29378 29392 29993 29999 30317 30331 30387 30446 30451 30461 30471 30477 30513 30543 30565 30740-30741 30826 31104 31120 31770 32937 32952 33050 33268 33694 33996 34008 34012 34043 34047 34058 34073 34099 34338 34384-34385 34423 34436 34450 34586 34781 34790 35147 35245 35325 35375 35861 36346 36492 36578 36686 36948 36956 37075 37125 37177 37238 37248 37287 37302 37346 37494 37522 37542 37652 37664 37671 37689 37695 37730 37745 37781 37783-37784 37788 37794 37838 37840 37968 38985 38997 39464 41128 41131 41134 41182 41484 41505 41526 41528 41530 41600 41647 41670 41681 41838 41981 42021 42096 42242 42272 42595 42624 42708 42751 42804 42958 42966 42968 42970 42990 43000 43009 43014 43019 43028 43150 43158 43187 44379 45108 45336 45351 46383 46598 46709 46721 46922 47120 47219 47366 47487 47833 47863 47953 48038 48061 48163 48559 49081 490887.952274030004205e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/580/A88?format=asciidefaultJ/A+A/580/A88/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharJ/A+A/580/A88/tablea1All targets analysed in this workPopPopulation (1)meta.id.parentcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (as in Simbad database)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatKsmagKs magnitudemagphot.mag;em.IR.KfloatSpTypeMK spectral typesrc.spTypecharpmRA? Proper motion along RAmas/yrpos.pm;pos.eq.radoublenullablepmDE? Proper motion along DEmas/yrpos.pm;pos.eq.decfloatnullableDist? Parallax distancepcpos.distance;pos.heliocentricfloatnullabler_Pop? Reference for Population, in refs.dat filemeta.ref;pos.frameintnullableSclSimbad object classificationmeta.code.class;src.classcharn_Scl[bc] Notes on Simbad Class (2)meta.notecharLflagLiterature flag (3)meta.codecharSflagSACY Flag (4)meta.codecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/580/A88/tableb1Photometry and parameters from individual observationsNameName (as in Simbad database)meta.id;meta.mainchare_Hmag1? rms uncertainty of Hmag1magstat.error;phot.mag;em.IR.HfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPA[0/361] Positional angle of componentdegpos.posAngfloate_PA[0.2/0.4] rms uncertainty on PAdegstat.errorfloatSep[0.09/11.5] Angular separationarcsecpos.angDistancefloate_Sep[0.01/0.02] rms uncertainty on ang_separcsecstat.errorfloatDateDate of observationtime.epochnullableInstFacility/instrument used for observationinstr.setupcharJmagJ magnitude in 2MASSmagphot.mag;em.IR.JfloatHmagH magnitude in 2MASSmagphot.mag;em.IR.HfloatKmagK magnitude in 2MASSmagphot.mag;em.IR.KfloatJ2mag? J magnitude of component in 2MASSmagphot.mag;em.IR.JfloatnullableH2mag? H magnitude of component in 2MASSmagphot.mag;em.IR.HfloatnullableK2mag? K magnitude of component in 2MASSmagphot.mag;em.IR.KfloatnullabledJmag? Observed difference magnitude in J bandmagphot.mag;arith.difffloatnullabledHmag? Observed difference magnitude in H bandmagphot.mag;arith.difffloatnullablee_dHmag? Relative uncertainty on observed magnitudemagstat.error;phot.magfloatnullabledKmag? Observed difference magnitude in K bandmagphot.mag;arith.difffloatnullableJmag1? Derived J magnitude of primarymagphot.mag;em.IR.Jfloatnullablee_Jmag1? rms uncertainty of Jmag1magstat.error;phot.mag;em.IR.JfloatnullableJmag2? Derived J magnitude of componentmagphot.mag;em.IR.Jfloatnullablee_Jmag2? rms uncertainty of Jmag2magstat.error;phot.mag;em.IR.JfloatnullableHmag1? Derived H magnitude of primarymagphot.mag;em.IR.HfloatnullableHmag2? Derived H magnitude of componentmagphot.mag;em.IR.Hfloatnullablee_Hmag2? rms uncertainty of Hmag2magstat.error;phot.mag;em.IR.HfloatnullableKmag1? Derived K magnitude of primarymagphot.mag;em.IR.Kfloatnullablee_Kmag1? rms uncertainty of Kmag1magstat.error;phot.mag;em.IR.KfloatnullableKmag2? Derived K magnitude of componentmagphot.mag;em.IR.Kfloatnullablee_Kmag2? rms uncertainty of Kmag2magstat.error;phot.mag;em.IR.KfloatnullablePr[0/1]? Probability component is boundstat.fit.goodnessfloatnullableMethMethod used to extract photometry: PSF or APERmeta.notecharIndex[1/127] Index number of entrymeta.idintSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad (declination part)degpos.eq.dec;meta.main