J/A+A/527/A24ivo://CDS.VizieR/J/A+A/527/A24doi:10.26093/cds/vizier.35270024CDSLodieu N.Dobbie P.D.Hambly N.C.2017-06-27T06:37:26Z2011-01-20T07:57:33ZCDS support team

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

cds-question@unistra.fropen-star-clusterslate-type-starsspectroscopyWe have obtained multi-fibre intermediate-resolution optical spectroscopy of 94 photometric and proper motion selected low-mass star and brown dwarf candidates in Upper Sco with the AAOmega spectrograph on the Anglo-Australian Telescope. We have estimated the spectral types and measured the equivalent widths of youth and gravity diagnostic features to confirm the spectroscopic membership of about 95% of the photometric and proper motion candidates extracted from 6.5 square degrees surveyed in Upper Sco by the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Clusters Survey (GCS). We have estimated the effective temperatures and masses for each new spectroscopic member using the latest evolutionary models available for low-mass stars and brown dwarfs. Combining the current optical spectroscopy presented here with near-infrared spectroscopy obtained for the faintest photometric candidates, we confirm the shape and slope of our earlier photometric mass function. The luminosity function drawn from the spectroscopic sample of 113 USco members peaks at around M6 and is flat at later spectral type. The mass function may peak at 0.2M_{sun}_ and is quite flat in the substellar regime. We observe a possible excess of cool low-mass brown dwarfs compared to IC 348 and the extrapolation of the field mass functions, supporting the original hypothesis that Upper Sco may possess an excess of brown dwarfs compared.2011A&A...527A..24Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/527/A24CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/527/A24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/527/A24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/527/A24https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/527/A24https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/527/A24http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/527/A24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/527/A24/tableb1 (Coordinates, photometry and astrometry of field stars in the AAOmega field-of-view)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/527/A24/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/527/A24/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/527/A24/tableb1?GETtext/xml+votable180.050000true241.4357083-23.21961110.005555555555555556Cone search capability for table J/A+A/527/A24/tablea5 (Confirmed spectroscopic members of the USco AAT/AAOmega (A) and Gemini/GNIRS (G))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/527/A24/tablea5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/527/A24/tablea5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/527/A24/tablea5?GETtext/xml+votable180.050000true242.0230833-22.30197220.005555555555555556Cone search capability for table J/A+A/527/A24/candid (List of USco member candidates, with spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/527/A24/candid?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/527/A24/candid?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/527/A24/candid?GETtext/xml+votable180.050000true242.0230833-22.30197220.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/527/A245/11088-11089 6/42986-42988 42990-42991 44361 443648.305533028865447e-20 2.3717893470513554e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/527/A24?format=asciiOpticaldefaultJ/A+A/527/A24/tableb1Coordinates, photometry and astrometry of field stars in the AAOmega field-of-viewrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name given when assigning fibres, fieldNNNNN (1)meta.id;meta.maincharSpDisplay the red spectrummeta.ref.urlcharZmagZ-band magnitude from the UKIDSS GCSmagphot.mag;em.opt.IfloatYmagY-band magnitude from the UKIDSS GCSmagphot.mag;em.opt.IfloatJmagJ-band magnitude from the UKIDSS GCSmagphot.mag;em.IR.JfloatHmagH-band magnitude from the UKIDSS GCSmagphot.mag;em.IR.HfloatKmagK-band magnitude from the UKIDSS GCSmagphot.mag;em.IR.KfloatpmRAProper motion in right ascensionmas/yrpos.pm;pos.eq.rafloatpmDEProper motion in declinationmas/yrpos.pm;pos.eq.decfloatSpTypeSpectral type of the objectsrc.spTypecharAssocDataAssociated Data web pagemeta.bib.pagecharSimbadSimbad column added by the CDSmeta.ref.urlcharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainJ/A+A/527/A24/tablea5Confirmed spectroscopic members of the USco AAT/AAOmega (A) and Gemini/GNIRS (G)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintF[AG] A for AAT/AAOmega, G for Gemini/GNIRScharJmagUKIDSS/J-band magnitudemagfloatWHa1? H{alpha} equivalent width0.1nmfloatnullableWHa2? H{alpha} equivalent width0.1nmfloatnullableWHa3? H{alpha} equivalent width0.1nmfloatnullableWHa4? H{alpha} equivalent width0.1nmfloatnullableWNaI1? NaI equivalent width0.1nmfloatnullableWNaI2? NaI equivalent width0.1nmfloatnullableWNaI3? NaI equivalent width0.1nmfloatnullableWNaI4? NaI equivalent width0.1nmfloatnullableWKI1? KI equivalent width0.1nmfloatnullableWKI2? KI equivalent width0.1nmfloatnullableWKI3? KI equivalent width0.1nmfloatnullableWKI4? KI equivalent width0.1nmfloatnullableTiO7140? TiO7140 spectral indexfloatnullableTiO8465? TiO8465 spectral indexfloatnullableNa8189? Na8189 spectral indexfloatnullablePC3? PC3 spectral index (1)floatnullableSp3? M subclass of spectral type, derived from PC3 spectral indexfloatnullableSpTM subclass of spectral type, estimated from spectral templatefloatTeffEffective temperatureKintLbolBolometric luminositysolLumfloatMassDerived masssolMassfloatSimbadSimbad column added by the CDSmeta.refcharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainJ/A+A/527/A24/candidList of USco member candidates, with spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCandidate name, USco_candNNNmeta.refcharRed[R] red spectrum in "sp" subdirectory (1)meta.codecharBlue[B] blue spectrum in "sp" subdirectory (1)meta.codecharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.main