J/ApJ/862/106ivo://CDS.VizieR/J/ApJ/862/106doi:10.26093/cds/vizier.18620106CDSTang S.-Y.Chen W.P.Chiang P.S.Jose J.Herczeg G.J.Goldman B.2019-07-26T12:31:37Z2019-06-23T16:22:15ZCDS support team

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

cds-question@unistra.frstellar-associationsstellar-distanceproper-motionsphotometryWe have identified stellar and substellar members in the nearby star cluster Coma Berenices, using photometry, proper motions, and distances of a combination of 2MASS, UKIDSS, URAT1, and Gaia/DR2 data. Those with Gaia/DR2 parallax measurements provide the most reliable sample to constrain the distance, averaging 86.7pc with a dispersion of 7.1pc, and age of ~800Myr, of the cluster. This age is older than the 400-600 Myr commonly adopted in the literature. Our analysis, complete within 5{deg} of the cluster radius, leads to identification of 192 candidates, among which, after field contamination is considered, about 148 are true members. The members have J~3mag to ~17.5mag, corresponding to stellar masses 2.3-0.06M_{sun}_. The mass function of the cluster peaks around 0.3M_{sun},_ and in the sense of dN/dm=m^-{alpha}^, where N is the number of members and m is stellar mass, with a slope {alpha}~=0.49+/-0.03 in the mass range 0.3-2.3M_{sun}_. This is much shallower than that of the field population in the solar neighborhood. The slope {alpha}=-1.69+/-0.14 from 0.3M_{sun}_ to 0.06M_{sun}_, the lowest mass in our sample. The cluster is mass-segregated and has a shape elongated toward the Galactic plane. Our list contains nine substellar members, including three new discoveries of an M8, an L1, and an L4 brown dwarfs, extending from the previously known coolest members of late-M types to even cooler types.2018ApJ...862..106Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/862/106CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/329 : URAT1 Catalog (Zacharias+ 2015)II/316 : UKIDSS-DR6 Galactic Plane Survey (Lucas+ 2012)II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)I/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/862/106https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/862/106http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/862/106https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/862/106https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/862/106http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/862/106GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/862/106/table2 (Candidate Members of Coma Ber)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/862/106/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/862/106/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/862/106/table2?GETtext/xml+votable180.050000true181.0939824.021440.005555555555555556Cone search capability for table J/ApJ/862/106/table3 (Selected Literature Members beyond the 5{deg} Radius Confirmed by This Work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/862/106/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/862/106/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/862/106/table3?GETtext/xml+votable180.050000true177.15728.27510.005555555555555556Cone search capability for table J/ApJ/862/106/table5 (Literature Candidates Rejected by Our Analysis)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/862/106/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/862/106/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/862/106/table5?GETtext/xml+votable180.050000true181.09424.021440.0055555555555555564/1758 1780 5/7023 7038 7109 7110 7111 7129 6/10403 10787 28071 28078 28079 28083 28085 28086 28087 28088 28089 28107 28108 28110 28111 28116 28122 28123 28144 28146 28147 28151 28156 28158 28416 28423 28431 28433 28435 28453 28467 28468 28469 28496 28498 28499 28502 28504 28505 28506 28508 28511 28513 28515 28528 28530 28531 28537 28560 285657.952274030004205e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/862/106?format=asciidefaultJ/ApJ/862/106/table2Candidate Members of Coma BerDistDistancepcpos.distancefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDMethDistance methodmeta.notecharNum[1/192] Internal index numbermeta.idintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainJmagApparent J band magnitudemagphot.mag;em.IR.Jfloate_JmagUncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatHmag? Apparent H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKsmagApparent Ks band magnitudemagphot.mag;em.IR.Kfloate_KsmagUncertainty in Ksmagmagstat.error;phot.mag;em.IR.KfloatpmRAProper motion along RA*cos(DE)mas/yrpos.pm;pos.eq.rafloatpmDEProper motion along DEmas/yrpos.pm;pos.eq.decfloate_pmUncertainty in proper motionmas/yrstat.errorfloatf_Dist[*] Flag on Dist (1)meta.codecharRefReference codes (2)meta.notecharDataData code (3)meta.codeintJ/ApJ/862/106/table3Selected Literature Members beyond the 5{deg} Radius Confirmed by This WorkDistDistancepcpos.distancefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNum[1/15] Internal index numbermeta.idintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainJmagApparent J band magnitudemagphot.mag;em.IR.Jfloate_JmagUncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatHmag? Apparent H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKsmagApparent Ks band magnitudemagphot.mag;em.IR.Kfloate_KsmagUncertainty in Ksmagmagstat.error;phot.mag;em.IR.KfloatpmRAProper motion along RA*cos(DE)mas/yrpos.pm;pos.eq.rafloatpmDEProper motion along DEmas/yrpos.pm;pos.eq.decfloate_pmUncertainty in proper motionmas/yrstat.errorfloatRefReference codes (1)meta.notecharJ/ApJ/862/106/table5Literature Candidates Rejected by Our AnalysisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainRefReference (1)meta.ref;pos.framecharRejRejection code (2)meta.codeintJ/ApJ/862/106/table6Stellar Colors from B2 to M4recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpTypeSpectral Typesrc.spTypecharg-rSDSS g-r colour indexmagphot.color;em.opt.B;em.opt.Rfloatr-iSDSS r-i colour indexmagphot.color;em.opt.R;em.opt.Ifloati-zSDSS i-z colour indexmagphot.color;em.opt.I;em.opt.Ifloatz-JSDSS 2MASS i-J colour indexmagphot.color;em.IR.H;em.IR.KfloatJ-H2MASS J-H colour indexmagphot.color;em.IR.J;em.IR.HfloatH-Ks2MASS H-Ks colour indexmagphot.color;em.IR.H;em.IR.KfloatKs-W12MASS WISE Ks-W1 colour indexmagphot.color;em.IR;em.IRfloatJ/ApJ/862/106/table7Colors of M DwarfsSpTypeSpectral Typesrc.spTypecharg-rPS1 g-r colour indexmagphot.color;em.opt.B;em.opt.RfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintr-iPS1 r-i colour indexmagphot.color;em.opt.R;em.opt.Ifloati-zPS1 i-z colour indexmagphot.color;em.opt.I;em.opt.Ifloatz-yPS1 z-y colour indexmagphot.color;em.opt.V;em.opt.Ifloaty-JPS1 2MASS y-J colour indexmagphot.color;em.opt;em.IRfloatJ-H2MASS J-H colour indexmagphot.color;em.IR.J;em.IR.HfloatH-Ks2MASS H-Ks colour indexmagphot.color;em.IR.H;em.IR.KfloatKs-W12MASS WISE Ks-W1 colour indexmagphot.color;em.IR;em.IRfloatW1-W2WISE W1-W2 colour indexmagphot.color;em.IR;em.IRfloatJ/ApJ/862/106/table8Median Colors of Brown DwarfsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpTypeSpectral Typesrc.spTypechari-zSDSS i-z colour indexmagphot.color;em.opt.I;em.opt.Ifloatz-YSDSS UKIDSS z-Y colour indexmagphot.color;em.opt.V;em.opt.IfloatY-JUKIDSS Y-J colour indexmagphot.color;em.opt;em.IRfloatJ-HUKIDSS J-H colour indexmagphot.color;em.IR.J;em.IR.HfloatH-KUKIDSS H-K colour indexmagphot.color;em.IR.H;em.IR.KfloatK-W1UKIDSS WISE K-W1 colour indexmagphot.color;em.IR;em.IRfloatW1-W2WISE W1-W2 colour indexmagphot.color;em.IR;em.IRfloat