J/MNRAS/465/4723ivo://CDS.VizieR/J/MNRAS/465/4723doi:10.26093/cds/vizier.74654723CDSKoen C.Miszalski B.Vaisanen P.Koen T.2024-08-16T20:20:24Z2019-09-12T14:59:00ZCDS support team

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

cds-question@unistra.frbrown-dwarfsNew spectra of 81 ultracool dwarfs (spectral types M7 and later) are discussed. Spectral classifications of 49 objects are available in the literature, while 32 objects are newly classified. The known spectral types were used to test an automated classification scheme, which relies primarily on template fitting, supplemented by matching of spectral indices calibrated against the template spectra. An attempt was made to quantify the uncertainty in the spectral types, which is generally better than two subclasses. Objects for which spectral types differ by more than one subclass from the literature classifications are discussed individually. Discrepancies between automated classifications based on, respectively, template fitting and spectral index matching, may be useful for flagging objects with unusual spectra. Aside from the 32 first-time classifications, alternative classifications are presented for 32 previously classified dwarfs. Very large (equivalent width greater than 130{AA}) H{alpha} flares are reported for the known ultracool dwarf binary 2MASS J15200224-4422419; curiously, the object does not appear to have quiescent emission lines. Non-zero equivalent-width measurements are listed for a further 29 objects.2017MNRAS.465.4723Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/465/4723CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/465/4723https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/465/4723http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/465/4723https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/465/4723https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/465/4723http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/465/4723GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/465/4723/table1 (Log of SALT-RSS observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/465/4723/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/465/4723/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/465/4723/table1?GETtext/xml+votable180.050000true162.1783751.19944440.0055555555555555566/16867 16906 17075 17115 18060 18683 20952 20964 21271 21515 21622 21724 24580 25015 26300 27058 27201 28800 29034 29157 29301 29636 29890 30505 30833 31011 31035 31062 31747 33437 33481 33667 34818 34893 35202 35364 35387 35509 36772 37211 37213 37245 37502 37565 37632 37919 37932 38176 38282 38598 38601 38880 39038 39198 39230 39347 39360 39670 39851 39873 39884 40076 40583 40656 40738 41336 41450 41557 41639 41869 41906-41907 41995 42422 42635 42961 43194 43224 43236 43532 43966 44416 44486 44807 45466 45752 46094 46138 48455 48883https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/465/4723?format=asciidefaultJ/MNRAS/465/4723/table1Log of SALT-RSS observationsEcxTimeExposure timestime.duration;obs.exposurecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS name (HHMMSSss+DDMMsss)meta.id;meta.maincharObs.DateObservation datetime.epoch;obsnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPosition from 2MASS name (right ascension part)degpos.eq.ra;meta.main_DEPosition from 2MASS name (declination part)degpos.eq.dec;meta.main