J/ApJ/645/676ivo://CDS.VizieR/J/ApJ/645/676doi:10.26093/cds/vizier.16450676CDSLuhman K.L.2008-02-01T03:51:34Z2008-02-01T04:48:52ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsinfrared-photometryBy combining photometry from the 2MASS Point Source Catalog and the USNO-B1.0 catalog with optical and infrared spectroscopy, I have performed a search for young brown dwarfs in an area of 225deg^2^ encompassing all of the Taurus star-forming region (tau~1Myr). From this work, I have discovered 22 new members of Taurus, 5 of which were independently found by Guieu and coworkers (2006, Cat. <J/A+A/446/485>). Sixteen of these new members have spectral types later than M6 and thus are likely to be brown dwarfs according to the theoretical evolutionary models of Chabrier and Baraffe (2000ApJ...542..464C). After adding these new members to the previously known members of Taurus, I have compared the spatial distributions of stars and brown dwarfs across the entire region. I find no statistically significant difference between these two distributions. Taurus does not contain the large, extended population of brown dwarfs that has been predicted by some embryo ejection models for the formation of brown dwarfs. However, these results are consistent with other ejection models, as well as models in which stars and brown dwarfs share a common formation mechanism.2006ApJ...645..676Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/645/676CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/645/676https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/645/676http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/645/676https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/645/676https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/645/676http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/645/676GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/645/676/table2 (Field Stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/645/676/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/645/676/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/645/676/table2?GETtext/xml+votable180.050000true62.466958328.36108330.005555555555555556Cone search capability for table J/ApJ/645/676/table3 (Members of Taurus)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/645/676/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/645/676/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/645/676/table3?GETtext/xml+votable180.050000true64.742208328.20650.0055555555555555566/341 342 1026 1029 1031 1037 1039 1040 1046 1048 1050 1051 1052 1054 1059 1060 1061 1068 1069 1073 1074 1075 1078 1079 1080 1082 1084 1090 1091 1099 1101 1124 1136 1153 1164 1165 1168 1169 1170 1179 23535 23540 23542 23548 23551 24201 24242 242468.650015785639275e-20 9.710690472292815e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/645/676?format=asciiInfrareddefaultJ/ApJ/645/676/table2Field StarsKsmag2MASS PSC Ks magnitudemagphot.mag;em.IR.KfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS PSC designation (JHHMMSSss+DDMMSSs)meta.id;meta.maincharn_2MASS[bcd] Note on 2MASS (1)meta.notecharSpTypeSpectral Typesrc.spTypecharJ-H2MASS PSC J-H colour indexmagphot.color;em.IR.J;em.IR.HfloatH-Ks2MASS PSC H-Ks colour indexmagphot.color;em.IR.H;em.IR.KfloatNightsNight numbers (defined in table1)meta.numberchar_RAPosition (from 2MASS name) (right ascension part)degpos.eq.ra;meta.main_DEPosition (from 2MASS name) (declination part)degpos.eq.dec;meta.mainJ/ApJ/645/676/table1Observing LogNightNight numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of observationtime.epoch;obsnullableTelTelescope + InstrumentinstrcharDispDispersive instrumentmeta.id;instrcharlambda1Wavelength intervaluminstr.bandwidthfloatlambda2Wavelength intervaluminstr.bandwidthfloatResollambda/Delta{lambda} resolutionspect.resolutionintJ/ApJ/645/676/table3Members of TaurusSpTypesSpectral Types (1)src.spTypecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintf_2MASS[PN] Previously known or New Membermeta.codechar2MASS2MASS PSC name (JHHMMSSss+DDMMSSs)meta.id;meta.maincharn_2MASS[d] d: Also discovered by C. Slesnick et al. (2006), in preparation.meta.notecharOnamesOther Namesmeta.idcharr_SpTypesReference for SpTypes (3)meta.ref;pos.framecharMembMembership Evidence (2)meta.code.membercharJ-H2MASS PSC J-H colour indexmagphot.color;em.IR.J;em.IR.HfloatH-Ks2MASS PSC H-Ks colour indexmagphot.color;em.IR.H;em.IR.KfloatKsmag2MASS PSC Ks magnitudemagphot.mag;em.IR.KfloatNightsNight numbers (defined in table1)meta.numberchar_RAPosition (from 2MASS name) (right ascension part)degpos.eq.ra;meta.main_DEPosition (from 2MASS name) (declination part)degpos.eq.dec;meta.main