J/ApJ/476/311ivo://CDS.VizieR/J/ApJ/476/311doi:10.26093/cds/vizier.14760311CDSKirkpatrick J.D.Beichman C.A.Skrutskie M.F.1999-02-02T09:12:30Z1999-02-02T10:12:25ZCDS support team

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

cds-question@unistra.frinfrared-sourcesdwarf-starslate-type-starsphotometryWe have obtained follow-up spectroscopy of eight late dwarf candidates discovered in a 105deg^2^ area observed with the 2MASS (2 Micron All-Sky Survey) Prototype Camera during test runs between 1992 and 1994. These objects were chosen because of their red infrared colors (e.g., J-Ks>=1.10) and/or red OIR colors (e.g., R-Ks>=6.00). All eight are late M dwarfs, six of which have spectral types later than van Biesbroeck 8 (type M7 V). Despite the fact that we have only followed up a fraction of the reddest sources discovered, the number of known M dwarfs of type M7 and cooler has been increased by 30%. Extrapolation of these results alone shows that over 2000 dwarfs of similar spectral type and with Ks<=14.0 will be imaged by 2MASS over the entire sky. One of these new discoveries is astonishingly cool and has a tentative type of >=M10V. This dwarf, one of the least luminous objects yet discovered, could itself be a high-mass brown dwarf, thus providing another empirical data point in a regime where few such objects are now recognized. Only the substellar suspect GD 165 B and the bona fide brown dwarf GL 229 B, both discovered as companions to known stars, are cooler. Thus, this 2MASS discovery becomes the coolest isolated object so far identified.1997ApJ...476..311Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/476/311CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/476/311https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/476/311http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/476/311https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/476/311https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/476/311http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/476/311GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/ApJ/476/311/table2Target list of 2MASS discoveriesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintName2MASP name (1)meta.id;meta.maincharprimaryl_muLimit flag on mumeta.code.errorcharmu? Total Proper motion (2)arcsec/yrpos.pmfloatnullableu_mu[: ] Uncertainty flag on mumeta.code.errorchartheta? Position angle of Proper motion (2)degpos.posAngintnullableu_theta[: ] Uncertainty flag on thetameta.code.errorcharl_RAPMLimit flag on RAPMmeta.code.errorcharRAPMR_APM_ magnitude (3)magphot.mag;em.opt.RfloatJmag? J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.errorfloatnullableHmag? H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.errorfloatnullableKsmagKs magnitudemagphot.mag;em.IR.Kfloate_Ksmagrms uncertainty on Ksmagmagstat.errorfloatl_RAPM-KsLimit flag on RAPM-Ksmeta.code.errorcharRAPM-KsRAPM-Ks colour indexmagphot.colorfloatJ-Ks? J-Ks colour indexmagphot.colorfloatnullableJ/ApJ/476/311/table4Spectroscopic observations of 2MASS discoveriesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintName2MASP namemeta.id;meta.maincharprimarySpTypeSpectral typesrc.spTypecharn_SpType[b] Note on SpType (1)meta.notecharObsObservation date (UT)time.epochnullableIntTimeIntegration timestime.duration;obs.exposureintInstInstrumentmeta.id;instrcharl_Dist[~> ] Limit flag on Distmeta.code.errorcharDistEstimated distancepcpos.distanceintn_Dist[a] Not eon Dist (2)meta.notechar