J/AJ/123/2806ivo://CDS.VizieR/J/AJ/123/2806doi:10.26093/cds/vizier.51232806CDSReid I.N.Cruz K.L.2023-04-06T16:50:48Z2005-06-23T10:11:24ZCDS support team

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

cds-question@unistra.frstellar-distancevisible-astronomytrigonometric-parallaxinfrared-photometryWe are currently undertaking a program aimed at identifying previously unrecognized late-type dwarfs within 20pc of the Sun. As a first step, we have cross-referenced Luyten's NLTT proper-motion catalog (Cat. <I/98>) against the second incremental release of the Two Micron All Sky Survey (2MASS) Point Source Catalog (Cat. <B/2mass>) and use optical/infrared colors, derived by combining Luyten's m_r_ estimates with 2MASS data, to identify candidate nearby stars. This paper describes the definition of a reference sample of 1245 stars and presents a compilation of literature data for more than one-third of the sample. Only 274 stars have trigonometric parallax measurements, but we have used data for nearby stars with well-determined trigonometric parallaxes to compute color-magnitude relations in the (M_V_, V-K), (M_V_, V-I), and (M_I_, I-J) planes and use those relations to determine photometric parallaxes for NLTT stars with optical photometry. Based on the 2MASS JHKs data alone, we have identified a further 42 ultracool dwarfs (J-Ks>0.99) and use J-Ks colors to estimate photometric parallaxes. Combining these various techniques, we identify 308 stars with formal distances of less than 20 pc, while a further 46 have distance estimates within 1{sigma} of survey limit. Of these 354 stars, 75, including 39 of the ultracool dwarfs, are new to nearby-star catalogs. Two stars with both optical and near-infrared photometry are potential additions to the immediate solar neighborhood, with formal distance estimates of less than 10 pc.2002AJ....123.2806Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/123/2806CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/2mass : The 2MASS database (IPAC/UMass, 2000)I/98 : NLTT Catalogue (Luyten, 1979)I/87 : LHS Catalogue, 2nd Edition (Luyten 1979)J/AJ/123/2822 : Photometry of southern NLTT stars (Reid+, 2002)J/AJ/123/2828 : Spectroscopy of northern NLTT stars (Cruz+, 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/123/2806https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/123/2806http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/123/2806https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/123/2806https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/123/2806http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/123/2806GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/123/2806/table1 (Photometric outliers)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/123/2806/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/123/2806/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/123/2806/table1?GETtext/xml+votable180.050000true39.19916732.0722220.005555555555555556Cone search capability for table J/AJ/123/2806/table2 (Close binary stars in the final sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/123/2806/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/123/2806/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/123/2806/table2?GETtext/xml+votable180.050000true1.4245.8102780.005555555555555556Cone search capability for table J/AJ/123/2806/table3 (Photometry and astrometry of NLTT stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/123/2806/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/123/2806/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/123/2806/table3?GETtext/xml+votable180.050000true1.29458345.7863890.005555555555555556Cone search capability for table J/AJ/123/2806/table6 (Spectroscopically confirmed ultracool dwarfs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/123/2806/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/123/2806/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/123/2806/table6?GETtext/xml+votable180.050000true135.09791721.8347220.005555555555555556Cone search capability for table J/AJ/123/2806/table7 (Photometrically selected ultracool dwarfs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/123/2806/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/123/2806/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/123/2806/table7?GETtext/xml+votable180.050000true153.7787531.4197220.0055555555555555566/239 297 304 307 309 360 399 428 447 488 497 547-548 553 572 624 725 734 791 815 824 826 836 838 865 918 947 993 1008 1032-1033 1098 1122 1126 1159 1551 1710 1723 1872 1875 2092 2159 2190 2194 2224 2330 2421 2499 2509 2515 2545 2572 2681 2737 2747 2764 2782-2783 2800 2850 2953 2956 2958 3088 3907 3910 3969 4336 4375 4444 4455 4560 4590-4591 4651 4672 4689 4693 4708 4716 4739 4768 4780 4801 4808 4867 4936 4960 4964 4985 4995 5000 5009 5176 5211 5225 5241 5264 5278 5318 5333 5343 5357 5387 5428 5449 5452 5463 5483 5534 5540 5558 5601 5651 5657 5680 5733 5810 5830 5842 6097 6153 6277 6316 6334 6340 6352 6384 6401 6419 6433 6530 6594 6653 6672 6676 6705 6736 6752 6776 6809 6836 6902 6951 7181 7512 7543 7594 7609 7611 7623 7625 7664-7665 7772 7775 7836-7837 7850 7881 7937 7968 7978 7980 7995 8073 8123 8394 8432 8446 8536 8562 8588 8591-8592 8733 8765 8773 8776 8850 8902 8939 9042 9178 9266 9339 9383 9399 9432 9436 9449 9477 9529 9578 9585 9629 9710-9711 9746-9747 9750 9752 9807 9825 9885 9929 10027 10037 10149 10156 10247 10381 10448 10464-10465 10467 10476 10497 10523 10550 10601 10619 10626 10669 10676 10683 10694 10721 10770 10850 10852 10891 10901 10905 10912 10915 10961 11028 11044 11172 11177 11204 11249 11255 11298 11371 11482 11632 11636 11717 11781 11832 11862 11869 11943 11962 12040 12167 12201 12489 12507 12568 12570 12601 12616 12679 12791 12814 12892 12915 13158 13175 13390 13417 13421 13427 13432 13512 13567 13669 13688 13693 13695 13724 13743 13793 13903 13926 14144-14145 14515 14570 14850 14910 14971-14972 14979 14982 14985 14993-14994 14998 15052 15061 15118 15144 15181 15239 15243 15885 16042 16543 16581 16651 16689 16754 16758 16827 17019-17020 17202 17255 17271 17283 17302 17328 17348 17358 17383 17485-17486 17511 17534 17568 17677 17712 17953-17954 17985 18056 18364 18440 18482 18747 18785 18959 18979 19040 19323 19387 19455 19668 19751 19766 19776-19777 19808 19879 19895 19901 19919 19958 19984 20023 20035 20074 20078 20084 20128 20239 20282 20311 20314 20345 20395 20473 21136 21413 21427 21480 21835 22518 22535 22657 22739 22813 23137 23144 23739 23743 23897 23910 24021 24093 24103 24209 24212-24213 24239 24249 24297 25426 25534 26299 26583 26614 26699 27765 27883 27956 27995 28080 28144 28242 28266 28343 28459 28477-28478 28494 28662 29941 30012 30017 31606 31730 31740 32278 32296 32314 32316-32317 32392 32458 32588 32596 32599 32730 32753 34535 34642 34743 35150 35625 35724 35786 35923 36483 36701 36765 36841 40181 40313 40429 40553 40820 40856 40868 40904 40941 43892 44226 44251 44318 44613 44752 44765 46327 46567 46573 46883 46922 46938 46962 47007 47054 47064 48080 48182 48263 48303-48304 48423 48485 48500 48516 48631 48654 48788 48879 48958 490108.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/123/2806?format=asciiOpticalInfrareddefaultJ/AJ/123/2806/table1Photometric outliersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNLTTDesignation from the NLTT <I/98> CataloguecharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainrmagr magnitudemagfloatr-Ks? r-Ks colour indexmagfloatnullableJ-HJ-H colour indexmagfloatH-Ks? H-Ks colour indexmagfloatnullableplxPhotometric parallaxmasfloate_plxrms uncertainty on plxmasfloatKsMAG? Ks absolute magnitudemagfloatnullableNotesIndividual notescharLinkLink to data from Luyten's NLTT (I/98) catalogcharJ/AJ/123/2806/table2Close binary stars in the final samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNLTTDesignation from the NLTT <I/98> CataloguecharprimaryNameOther namecharn_NameIndividual note (1)charRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainrmagr magnitudemagfloatJmag? J magnitudemagfloatnullableHmag? H magnitudemagfloatnullableKsmagKs magnitudemagfloatplx? Trigonometric parallaxmasfloatnullablee_plx? rms uncertainty on plxmasfloatnullabler_plx? Parallax reference (2)intnullableLinkLink to data from Luyten's NLTT (I/98) catalogcharJ/AJ/123/2806/table3Photometry and astrometry of NLTT starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNLTTThe designation from the NLTT Catalogue (1)charprimaryANameAlternative name (2)charLHS? Designation in Luyten's LHS catalogcharRAJ2000Hour of Right Ascension from 2MASS (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination from 2MASS (J2000)pos.eq.dec;meta.mainrmagThe NLTT r-band magnitudemagfloatVmagThe V-band magnitudemagfloatB-V? The (B-V) color on the Johnson systemmagfloatnullableV-R? The (V-R) color on the Cousins systemmagfloatnullableV-I? The (V-I) color on the Cousins systemmagfloatnullabler_Vmag? References for the optical observations, separated by comma, in ref3.dat filecharJmag? The 2MASS J-band magnitudemagfloatnullableHmag? The 2MASS H-band magnitudemagfloatnullableKsmagThe 2MASS K_S_ band magnitudemagfloatplx? Trigonometric parallaxmasfloatnullablee_plx? Uncertainty in plxmasfloatnullabler_plxSource of the astrometry (4)charLinkLink to data from Luyten's NLTT (I/98) catalogcharJ/AJ/123/2806/ref3References for optical observations in table3.datRefReference codeintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBibCodeBibCodecharAutAuthor's namecharComCommentscharJ/AJ/123/2806/table4Distance modulus estimates for NLTT starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNLTTDesignation from the NLTT <I/98> Catalogue (1)charn_NLTT[*] Flag not explicited in the papercharDM(V-Ks)Distance modulus derived from (V-K_S_) photometric parallaxmagfloate_DM(V-Ks)Uncertainty in DM(V-K)magfloatDM(V-Ic)? Distance modulus derived from (V-Ic) photometric parallaxmagfloatnullablee_DM(V-Ic)? Uncertainty in DM(V-Ic)magfloatnullableDM(Ic-J)? Distance modulus derived from (Ic-J) photometric parallaxmagfloatnullablee_DM(Ic-J)? Uncertainty in DM(Ic-J)magfloatnullableDMWeighted Distance modulus averagemagfloate_DMUncertainty in DMmagfloatDMplx? Distance modulus from trigonometric parallaxmagfloatnullablee_DMplx? Uncertainty in DMplxmagfloatnullableDistFinal weighted average distance (2)pcfloate_DistUncertainty in DistpcfloatKsMAGAbsolute K_S_ band magnitudemagfloatVMAGAbsolute V band magnitudemagfloatDistLimDistance limit (20pc) code (3)charJ/AJ/123/2806/table6Spectroscopically confirmed ultracool dwarfsrmagr magnitudemagfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNLTTDesignation from the NLTT <I/98> CataloguecharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainIcmag? Cousins I magnitudemagfloatnullableSpTypeSpectral typecharJmag? J magnitudemagfloatnullableHmag? H magnitudemagfloatnullableKsmagKs magnitudemagfloatDistSpectroscopic distancepcfloate_Distrms uncertainty on Distpcfloatr_Dist? Distance reference (1)intnullableKMAGAbsolute K magnitudemagfloatLinkLink to data from Luyten's NLTT (I/98) catalogcharJ/AJ/123/2806/table7Photometrically selected ultracool dwarfsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNLTTDesignation from the NLTT <I/98> CataloguecharprimaryLHS? The LHS (Cat. <I/87>) numberintnullableRAJ2000Hour of Right Ascension from 2MASS (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination from 2MASS (J2000)pos.eq.dec;meta.mainrmagThe NLTT r-band magnitudemagfloatJmagThe 2MASS J-band magnitudemagfloatHmagThe 2MASS H-band magnitudemagfloatKsmagThe 2MASS K_S_ band magnitudemagfloatKSMAGThe Absolute K_S_ band magnitudemagfloatDistPhotometric distance (1)pcfloate_DistUncertainty in DistpcfloatODist? Distance from table2.dat (2)pcfloatnullableLinkLink to data from Luyten's NLTT (I/98) catalogchar