J/MNRAS/450/3490ivo://CDS.VizieR/J/MNRAS/450/3490doi:10.26093/cds/vizier.74503490CDSDownes J.J.Roman-Zuniga C.Ballesteros-Paredes J.Mateu C.Briceno C.,Hernandez J.Petr-Gotzens M.G.Calvet N.Hartmann L.Mauco K.2024-08-14T20:21:53Z2016-02-03T16:06:28ZCDS support team

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

cds-question@unistra.fropen-star-clusterslate-type-starsvisible-astronomysloan-photometryinfrared-photometryWe present a study of 15 new brown dwarfs belonging to the ~7Myr old 25 Orionis group and Orion OB1a subassociation with spectral types between M6 and M9 and estimated masses between ~0.07 and ~0.01M_{sun}_. By comparing them through a Bayesian method with low-mass stars (0.8<~M/M_{sun}_ <~0.1) from previous works in the 25 Orionis group, we found statistically significant differences in the number fraction of classical T Tauri stars, Weak T Tauri stars, class II, evolved discs and purely photospheric emitters at both sides of the substellar mass limit. Particularly, we found a fraction of 3.9^+2.4^_-1.6_ percent low-mass stars classified as Classic T Tauri star and class II or evolved discs, against a fraction of 33.3^+10.8^_-9.8_ percent in the substellar mass domain. Our results support the suggested scenario in which the dissipation of discs is less efficient for decreasing mass of the central object.2015MNRAS.450.3490Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/450/3490CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/444/1793 : 25 Ori group low-mass stars (Downes+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/450/3490https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/450/3490http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/450/3490https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/450/3490https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/450/3490http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/450/3490GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/450/3490/table3 (Photometric catalog of the new BDs confirmed as members of 25 Ori or Orion OB1a)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/450/3490/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/450/3490/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/450/3490/table3?GETtext/xml+votable180.050000true80.79109951.7141280.0055555555555555565/5723 6/22904 22980-229811.3088508223161842e-20 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/450/3490?format=asciiOpticalInfrareddefaultJ/MNRAS/450/3490/targetsObserving log and spectroscopic catalogue for the candidates observed with OSIRIS (tables 1 and 2 of the paper)MembMembershipmeta.code.membercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTarget[1/21] Target IDmeta.idintObs.dateBeginning of the observation (YYYY-MM-DDThh:mm:ss.sss)time.epochcharTintIntegration timestime.epochintAirmassAirmassobs.airMassfloatSeeingSeeingsinstr.obsty.seeingfloatObsObserving conditionsmeta.notecharSpTypeMK spectral typesrc.spTypechare_SpTypeError on SpTypestat.error;src.spTypefloatCaHa[-1/1] Flag for CaHA feature (1)meta.codeintVO1[-1/1] Flag for VO1 feature (1)meta.codeintVO2[-1/1] Flag for VO2 feature (1)meta.codeintKI[-1/1] Flag for KI feature (1)meta.codeintNaI[-1/1] Flag for NaI feature (1)meta.codeintEWHa? H{alpha} line width0.1nmspect.line.eqWidth;em.line.HalphaintnullableAV? Extincion in V-bandmagphys.absorptionfloatnullableJ/MNRAS/450/3490/table3Photometric catalog of the new BDs confirmed as members of 25 Ori or Orion OB1arecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTarget[1/21] Target IDmeta.idintWISEWISE (JHHMMSS.ss+DDMMSS.s)meta.idchar2MASS2MASS name (HHMMSSss+DDMMSSs)meta.idcharSDSS9SDSS9 name (JHHMMSS.ss+DDMMSS.s)meta.idcharRAJ2000VISTA Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000VISTA Declination (J2000)degpos.eq.dec;meta.maingmag? SDSS g magnitudemagphot.mag;em.opt.Bfloatnullablee_gmag? rms uncertainty on gmagmagstat.error;phot.mag;em.opt.Bfloatnullablermag? SDSS r magnitudemagphot.mag;em.opt.Rfloatnullablee_rmag? rms uncertainty on rmagmagstat.error;phot.mag;em.opt.Rfloatnullableimag? SDSS i magnitudemagphot.mag;em.opt.Ifloatnullablee_imag? rms uncertainty on imagmagstat.error;phot.mag;em.opt.IfloatnullableImagVISTA I magnitudemagphot.mag;em.opt.Ifloate_Imagrms uncertainty on Imagmagstat.error;phot.mag;em.opt.Ifloatzmag? SDSS z magnitudemagphot.mag;em.opt.Ifloatnullablee_zmag? rms uncertainty on zmagmagstat.error;phot.mag;em.opt.IfloatnullableZmagVISTA Z magnitudemagphot.mag;em.opt.Ifloate_Zmagrms uncertainty on Zmagmagstat.error;phot.mag;em.opt.IdoubleYmagVISTA Y magnitudemagphot.mag;em.IR.Jfloate_Ymagrms uncertainty onYmagmagstat.error;phot.mag;em.opt.BdoubleJmagVISTA J magnitudemagphot.mag;em.IR.Jfloate_Jmagrms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JdoubleHmagVISTA H magnitudemagphot.mag;em.IR.Hfloate_Hmagrms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HdoubleKmagVISTA Ks magnitudemagphot.mag;em.IR.Kfloate_Kmagrms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kdouble[3.4]? WISE 3.4um magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.4]? rms uncertainty on [3.4]magstat.errorfloatnullable[3.6]IRAC 3.6um magnitudemagphot.mag;em.IR.3-4umfloate_[3.6]rms uncertainty on [3.6]magstat.errorfloat[4.5]IRAC 4.5um magnitudemagphot.mag;em.IR.4-8umfloate_[4.5]rms uncertainty on [4.5]magstat.errorfloat[4.6]? WISE 4.6um magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.6]? rms uncertainty on [4.6]magstat.errorfloatnullable[5.8]? IRAC 5.8um magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? rms uncertainty on [5.8]magstat.errorfloatnullable[8.0]? IRAC 8.0um magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? rms uncertainty on [8.0]magstat.errorfloatnullable[12]? WISE 12um magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[12]? rms uncertainty on [12]magstat.errorfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar