J/AJ/123/2828ivo://CDS.VizieR/J/AJ/123/2828doi:10.26093/cds/vizier.51232828CDSCruz K.L.Reid I.N.2023-04-06T16:50:48Z2003-08-26T23:22:13ZCDS support team

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

cds-question@unistra.frlate-type-starsdwarf-starsinfrared-photometryspectroscopystellar-distanceWe present initial results of an all-sky search for late-type dwarfs within 20pc of the Sun using the New Luyten Two-Tenths (NLTT) catalog cross-referenced with the Two Micron All Sky Survey (2MASS) database. The results were obtained with low-resolution optical spectroscopic follow-up of candidate nearby stars as a preliminary test of our methodology. M_J_, derived using spectral indices, and 2MASS J are used to estimate distances. Out of the 70 objects observed, 28 are identified as previously unrecognized objects within 25pc of the Sun, and up to 19 of these are within 20pc. One, LP 647-13, is an M9-type dwarf at 10.5pc, making it one of the four closest M9 dwarfs currently known. We also discuss the chromospheric activity of the observed dwarfs.2002AJ....123.2828Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/123/2828CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/98 : NLTT Catalogue (Luyten, 1979)B/2mass : The 2MASS database (IPAC/UMass, 2000)J/AJ/123/2806 : Nearby stars in the NLTT catalogue (Reid+, 2002)J/AJ/123/2822 : Photometry of southern NLTT stars (Reid+, 2002)J/AJ/126/2421 : 2MASS-Selected sample of ultracool dwarfs (Cruz+, 2003)J/AJ/126/2449 : Nearby ultracool dwarfs in galactic plane (Reid+, 2003)J/AJ/126/3007 : Spectroscopy of faint red NLTT dwarfs (Reid+, 2003)J/AJ/128/463 : A preliminary 20pc census from the NLTT cat. (Reid+, 2004)J/AJ/130/1680 : LSPM-North proper-motion catalog nearby stars (Lepine+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/123/2828https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/123/2828http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/123/2828https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/123/2828https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/123/2828http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/123/2828GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/123/2828/table1 (Previously known objects in our sample of NLTT targets)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/123/2828/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/123/2828/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/123/2828/table1?GETtext/xml+votable180.050000true5.1217533.08563330.005555555555555556Cone search capability for table J/AJ/123/2828/table2 (Data for targets included in NLTT sample 1)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/123/2828/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/123/2828/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/123/2828/table2?GETtext/xml+votable180.050000true5.318518.73222780.005555555555555556Cone search capability for table J/AJ/123/2828/table3 (Data for targets not included in NLTT sample 1)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/123/2828/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/123/2828/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/123/2828/table3?GETtext/xml+votable180.050000true1.6977917-8.876450.0055555555555555566/239 360 367 399 405 488 526 551 586 671 807 823 1029 1193 1583 1594 2325 2330 2356 2650 2862 2874 3517 3969 12731 13062 13376 13383 13389 13531 13659 13682 13688 16489 16576 16595 16746 16901 16949 16971 17259 17283 17328 17412 17547 17677 17712 17953 17985 18385 18411 18482 18571 18574 18588 18609 18702 18722 18742 18979-18980 18999 19323 19680 19836 19855 19895 20089 20136 20281 20345 21135 21159 21161 22535 22604 22633 22657 22739 23144 23519 24249 34718 34743 34751 35923 36039 36112 36256 36526 36619 36765 36788 36842 485398.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/123/2828?format=asciiOpticalInfrareddefaultJ/AJ/123/2828/table1Previously known objects in our sample of NLTT targetsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNLTTName from NLTT (I/98) Catalogue (1)meta.id;meta.maincharprimaryn_NLTT[a-d] Note on NLTT (2)meta.notecharONameOther namemeta.idcharRAJ20002MASS source right ascension (J2000.0)pos.eq.ra;meta.mainDEJ20002MASS source declination (J2000.0)pos.eq.dec;meta.mainVMAG? Absolute V magnitudemagphys.magAbs;em.optfloatnullabler_VMAG? Reference for VMAG (3)meta.refintnullableJMAG? Absolute J magnitude, obtained using our distance estimatesmagphys.magAbs;em.optfloatnullablee_JMAG? rms uncertainty on JMAGmagstat.errorfloatnullablermag? r magnitude, given in the NLTTmagphot.mag;em.opt.RfloatnullableJmag? J magnitude form 2MASSmagphot.mag;em.IR.JfloatnullableHmag? H magnitude form 2MASSmagphot.mag;em.IR.HfloatnullableKsmag? Ks magnitude form 2MASSmagphot.mag;em.IR.KfloatnullableDist? Distancepcpos.distancefloatnullablee_Dist? rms uncertainty on Distpcstat.errorfloatnullabler_Dist? Source of trigonometric parallax (4) (3)meta.refintnullabler_Dist2? Source of photometry, separated by comma (4) (3)meta.refcharSpTypeSpectral typesrc.spTypecharr_SpType? Reference for SpType (4)meta.refintnullableJ/AJ/123/2828/table2Data for targets included in NLTT sample 1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNLTTName from NLTT (I/98) Catalogue (1)meta.id;meta.maincharprimaryn_NLTT[d-k] Individual note (2)meta.notecharONameOther namemeta.idcharRAJ20002MASS source right ascension (J2000.0)pos.eq.ra;meta.mainDEJ20002MASS source declination (J2000.0)pos.eq.dec;meta.mainrmag? r magnitude, given in the NLTTmagphot.mag;em.opt.RfloatnullableJmag? J magnitude form 2MASSmagphot.mag;em.IR.JfloatnullableHmag? H magnitude form 2MASSmagphot.mag;em.IR.HfloatnullableKsmag? Ks magnitude form 2MASSmagphot.mag;em.IR.KfloatnullableJMAGTiO5? Predicted absolute J magnitude based on the spectral index TiO 5 TiO 5 = F(7126-7135{AA})/F(7042-7046{AA})magphys.magAbs;em.optfloatnullablee_JMAGTiO5? rms uncertainty on JMAGTiO5magstat.errorfloatnullablen_JMAGTiO5[a] Note (3)meta.notecharJMAGCaH2? Predicted absolute J magnitude based on the spectral index CaH 2 CaH 2 = F(6814-6846{AA})/F(7042-7046{AA})magphys.magAbs;em.optfloatnullablee_JMAGCaH2? rms uncertainty on JMAGCaH2magstat.errorfloatnullablen_JMAGCaH2[ab] Note (3)meta.notecharJMAGCaOH? Predicted absolute J magnitude based on the spectral index CaOH CaOH = F(6230-6240{AA})/F(6345-6354{AA})magphys.magAbs;em.optfloatnullablee_JMAGCaOH? rms uncertainty on JMAGCaOHmagstat.errorfloatnullablen_JMAGCaOH[abc] Note (3)meta.notecharJMAG? Final absolute J magnitude estimatemagphys.magAbs;em.optfloatnullablee_JMAG? rms uncertainty on JMAGmagstat.errorfloatnullableDist? Photometric estimated distancepcpos.distancefloatnullablee_Dist? rms uncertainty on Distpcstat.errorfloatnullablen_Dist[*] Note (4)meta.notecharSpTypeSpectral typesrc.spTypecharFlag[YN?] Flag that indicates whether the object lies within our distance limit of 20 pc ("Y") within 1 {sigma} of the boundary ("?"), or beyond the limit ("N"), for table2.dat onlymeta.codecharJ/AJ/123/2828/table3Data for targets not included in NLTT sample 1n_JMAGCaH2[ab] Note (3)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNLTTName from NLTT (I/98) Catalogue (1)meta.id;meta.maincharprimaryn_NLTT[d-k] Individual note (2)meta.notecharONameOther namemeta.idcharRAJ20002MASS source right ascension (J2000.0)pos.eq.ra;meta.mainDEJ20002MASS source declination (J2000.0)pos.eq.dec;meta.mainrmag? r magnitude, given in the NLTTmagphot.mag;em.opt.RfloatnullableJmag? J magnitude form 2MASSmagphot.mag;em.IR.JfloatnullableHmag? H magnitude form 2MASSmagphot.mag;em.IR.HfloatnullableKsmag? Ks magnitude form 2MASSmagphot.mag;em.IR.KfloatnullableJMAGTiO5? Predicted absolute J magnitude based on the spectral index TiO 5 TiO 5 = F(7126-7135{AA})/F(7042-7046{AA})magphys.magAbs;em.optfloatnullablee_JMAGTiO5? rms uncertainty on JMAGTiO5magstat.errorfloatnullablen_JMAGTiO5[a] Note (3)meta.notecharJMAGCaH2? Predicted absolute J magnitude based on the spectral index CaH 2 CaH 2 = F(6814-6846{AA})/F(7042-7046{AA})magphys.magAbs;em.optfloatnullablee_JMAGCaH2? rms uncertainty on JMAGCaH2magstat.errorfloatnullableJMAGCaOH? Predicted absolute J magnitude based on the spectral index CaOH CaOH = F(6230-6240{AA})/F(6345-6354{AA})magphys.magAbs;em.optfloatnullablee_JMAGCaOH? rms uncertainty on JMAGCaOHmagstat.errorfloatnullablen_JMAGCaOH[abc] Note (3)meta.notecharJMAG? Final absolute J magnitude estimatemagphys.magAbs;em.optfloatnullablee_JMAG? rms uncertainty on JMAGmagstat.errorfloatnullableDist? Photometric estimated distancepcpos.distancefloatnullablee_Dist? rms uncertainty on Distpcstat.errorfloatnullablen_Dist[*] Note (4)meta.notecharSpTypeSpectral typesrc.spTypecharFlag[YN?] Flag that indicates whether the object lies within our distance limit of 20 pc ("Y") within 1 {sigma} of the boundary ("?"), or beyond the limit ("N"), for table2.dat onlymeta.codecharJ/AJ/123/2828/table5Spectral Indices for All Targets and StandardsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNLTTThe object namemeta.id;meta.mainchar2MASSThe 2MASS namemeta.id.crosscharCaOHThe CaOH spectral index (1)spect.indexfloatHaThe H{alpha} spectral index (2)spect.index;em.line.HalphafloatCaH1The CaH 1 spectral index (3)spect.indexfloatCaH2The CaH 2 spectral index (4)spect.indexfloatCaH3The CaH 3 spectral index (5)spect.indexfloatTiO-aThe TiO-a spectral index (6)spect.indexfloatTiO2The TiO 2 spectral index (7)spect.indexfloatTiO3The TiO 3 spectral index (8)spect.indexfloatTiO4The TiO 4 spectral index (9)spect.indexfloatTiO5The TiO 5 spectral index (10)spect.indexfloatVO-aThe VO-a spectral index (11)spect.indexfloatPC3The PC3 spectral index (12)spect.indexfloatJ/AJ/123/2828/table6ActivityrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNLTTThe object namemeta.id;meta.mainchar2MASSThe 2MASS namemeta.id.crosscharFHaH{alpha} flux in units of 10^-15^ergs/cm^2^/s1e-18W.m**-2phot.flux;em.line.HalphafloatEWHaH{alpha} equivalent width in Angstroems0.1nmspect.line.eqWidthfloatMBolBolometric magnitudemagphot.mag.bolfloatlogRatLog of the H{alpha} to bolometric flux ratiophot.flux;arith.ratiofloat