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J/AJ/128/463  A preliminary 20pc census from the NLTT catalogue    (Reid+, 2004)

Meeting the cool neighbors. VIII. A preliminary 20 parsec census from the NLTT catalogue. Reid I.N., Cruz K.L., Allen P., Mungall F., Kilkenny D., Liebert J., Hawley S.L., Fraser O.J., Covey K.R., Lowrance P., Kirkpatrick J.D., Burgasser A.J. <Astron. J., 128, 463-483 (2004)> =2004AJ....128..463R
ADC_Keywords: Stars, nearby ; Parallaxes, trigonometric ; Photometry, infrared ; Photometry, UBVRI Keywords: stellar content - stars: low-mass, brown dwarfs - stars: luminosity function, mass function Abstract: Continuing our census of late-type dwarfs in the solar neighborhood, we present BVRI photometry and optical spectroscopy of 800 mid-type M dwarfs drawn from the NLTT proper-motion catalog. The targets are taken both from our own cross-referencing of the NLTT Catalogue and the 2MASS Second Incremental Data Release, and from the revised NLTT compiled recently by Salim & Gould (Cat. J/ApJ/582/1011). All are identified as nearby-star candidates based on their location in the (mr, mr-Ks) diagram. Three hundred stars discussed here have previous astrometric, photometric, or spectroscopic observations. We present new BVRI photometry for 101 stars, together with low-resolution spectroscopy of a further 400 dwarfs. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 140 168 Known nearby stars from NLTT2 sample table2.dat 140 151 Known nearby stars from NLTT3 sample refs.dat 166 27 References notes.dat 80 102 Notes table3.dat 118 101 SAAO photometry of NLTT2 and NLTT3 stars table4.dat 64 447 Narrowband indices for NLTT dwarfs table5.dat 91 447 Astrometry and photometry of spectroscopic targets table6.dat 112 71 Early-type M dwarfs from the revised NLTT: Hipparcos stars table7.dat 91 13 Early-type M dwarfs from the rNLTT with no Hipparcos data table8.dat 114 213 Additional stars in the 2MASS 2nd release 20parsec sample
See also: I/98 : NLTT Catalogue (Luyten, 1979) J/ApJ/582/1011 : Revised NLTT Catalog (rNLTT, Salim+, 2003) 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/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/130/1680 : LSPM-North proper-motion catalog nearby stars (Lepine+, 2005) Byte-by-byte Description of file: table[12].dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name NLTT Catalogue name (G1) 13- 14 A2 --- f_Name Flag on Name (G2) 16- 26 A11 --- OName Other name (G3) 28- 29 I2 h RAh 2MASS hour of right ascension (J2000) 31- 32 I2 min RAm 2MASS minute of right ascension (J2000) 34- 37 F4.1 s RAs 2MASS second of right ascension (J2000) 39 A1 --- DE- 2MASS sign of the declination (J2000) 40- 41 I2 deg DEd 2MASS degree of declination (J2000) 43- 44 I2 arcmin DEm 2MASS arcminute of declination (J2000) 46- 47 I2 arcsec DEs 2MASS arcsecond of declination (J2000) 49- 52 F4.1 mag rmag Luyten r-band magnitude 54- 58 F5.2 mag Jmag 2MASS J-band magnitude 60- 64 F5.2 mag Hmag 2MASS H-band magnitude 66- 70 F5.2 mag Ksmag 2MASS Ks band magnitude 72- 76 F5.2 mag Vmag ? The V-band magnitude 77 A1 --- u_Vmag [:] Uncertainty flag on Vmag 79- 82 F4.2 mag B-V ? The (B-V) color index 83 A1 --- u_B-V [:] Uncertainty flag on B-V 85- 89 F5.2 mag V-Rc ? The (V-Rc) color index 91- 94 F4.2 mag V-Ic ? The (V-Ic) color index 96- 97 I2 --- r_Vmag [0/20]? Optical photometry source 99-105 F7.3 mas plx ? Trigonometric parallax 107-108 I2 mas e_plx ? Uncertainty in plx 110-111 I2 --- r_plx ? Reference for plx 113-116 A4 --- SpType MK spectral type 118-122 F5.2 mag m-M Estimated distance modulus 124-127 F4.2 mag e_m-M Uncertainty in m-M 129-133 F5.2 mag JMAG Absolute 2MASS J-band magnitude 135-140 A6 --- Note Additional comments (see file notes.dat)
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- Bibcode Bibcode 24- 41 A18 --- Aut Author's name 43-166 A124 --- Com Comments
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Note Note number 4- 80 A77 --- Text Text of Comments
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [NLTT] 5 A1 --- n_Name [123] NLTT candidate list 7- 17 A11 --- Name NLTT Catalogue name (G1) 19- 20 A2 --- f_Name Flag on Name (G2) 22- 31 A10 --- OName Other name (1) 33- 34 I2 h RAh 2MASS hour of right ascension (J2000) 36- 37 I2 min RAm 2MASS minute of right ascension (J2000) 39- 42 F4.1 s RAs 2MASS second of right ascension (J2000) 44 A1 --- DE- 2MASS sign of the declination (J2000) 45- 46 I2 deg DEd 2MASS degree of declination (J2000) 48- 49 I2 arcmin DEm 2MASS arcminute of declination (J2000) 51- 52 I2 arcsec DEs 2MASS arcsecond of declination (J2000) 54- 57 F4.1 mag rmag Luyten r-band magnitude 59- 63 F5.2 mag Jmag 2MASS J-band magnitude 65- 69 F5.2 mag Hmag 2MASS H-band magnitude 71- 75 F5.2 mag Ksmag 2MASS Ks band magnitude 77- 81 F5.2 mag Vmag The V-band magnitude 83- 86 F4.2 mag B-V ? The (B-V) color index 88- 91 F4.2 mag V-Rc The (V-Rc) color index 93- 96 F4.2 mag V-Ic The (V-Ic) color index 98 I1 --- NObs Number of observations 100-104 F5.2 mag m-M Estimated distance modulus 106-109 F4.2 mag e_m-M Uncertainty in m-M 111-114 F4.2 mag JMAG Absolute 2MASS J-band magnitude 116-117 I2 --- Note ? Additional comments (see file notes.dat)
Note (1): Usually from either the CNS3 (Cat. V/70) or the LHS Catalogue (Cat. I/279).
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [NLTT] 5 A1 --- n_Name [123] NLTT candidate list 7- 18 A12 --- Name NLTT Catalogue name (G1) 20- 23 F4.2 --- TiO5 F(7126-7135Å)/F(7042-7046Å) 25- 28 F4.2 --- CaOH ?F(6230-6240Å)/F(6345-6354Å) 30- 33 F4.2 --- CaH1 ?F(6380-6390Å)/F(6345-6355Å+6410-6430Å) 35- 38 F4.2 --- CaH2 F(6814-6846Å)/F(7042-7046Å) 40- 43 F4.2 --- CaH3 F(6960-6990Å)/F(7042-7046Å) 45- 48 F4.2 --- TiO-a F(7033-7048Å)/F(7058-7073Å) 50- 53 F4.2 --- VO-a F(7350-7370Å+7550-7570Å)/F(7430-7470Å) 55- 58 F4.2 --- Halpha Hα index F(6560-6566Å)/F(6545-6555Å) 60- 63 A4 --- SpType MK Spectral type
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [NLTT] 5 A1 --- n_Name [123] NLTT candidate list 7- 18 A12 --- Name NLTT Catalogue name (G1) 23- 24 A2 --- f_Name Flag on Name (G2) 26- 27 I2 h RAh Hour of right ascension (J2000) 29- 30 I2 min RAm Minute of right ascension (J2000) 32- 35 F4.1 s RAs Second of right ascension (J2000) 37 A1 --- DE- Sign of the declination (J2000) 38- 39 I2 deg DEd Degree of declination (J2000) 41- 42 I2 arcmin DEm Arcminute of declination (J2000) 44- 45 I2 arcsec DEs Arcsecond of declination (J2000) 47- 50 F4.1 mag rmag Luyten r-band magnitude 51 A1 --- u_rmag [:] Uncertainty flag on rmag 53- 58 F6.3 mag Jmag 2MASS-2nd J-band magnitude 60 A1 --- f_Jmag [1] Flag on Jmag (3) 62- 67 F6.3 mag Hmag 2MASS-2nd H-band magnitude 69- 74 F6.3 mag Ksmag 2MASS-2nd Ks band magnitude 76- 80 F5.2 mag JMAG 2MASS-2nd absolute J-band magnitude 82- 86 F5.1 pc Dist Distance 88- 91 F4.1 pc e_Dist Uncertainty in Dist
Note (3): Flag on Jmag: 1 = Star with JHKs from the 2MASS All-Sky Data Release.
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 5 I5 --- rNLTT NLTT Catalogue number 7- 17 A11 --- Name NLTT Catalogue name 19- 24 I6 --- HIP Hipparcos Catalogue number 26- 27 I2 h RAh Hour of right ascension (J2000) 29- 30 I2 min RAm Minute of right ascension (J2000) 32- 36 F5.2 s RAs Second of right ascension (J2000) 38 A1 --- DE- Sign of the declination (J2000) 39- 40 I2 deg DEd Degree of declination (J2000) 42- 43 I2 arcmin DEm Arcminute of declination (J2000) 45- 48 F4.1 arcsec DEs Arcsecond of declination (J2000) 50- 54 F5.2 mag Vmag The rNLTT V-band magnitude 56- 60 F5.3 mag Jmag 2MASS J-band magnitude 62- 66 F5.3 mag Hmag 2MASS H-band magnitude 68- 72 F5.3 mag Ksmag 2MASS Ks band magnitude 74- 78 F5.1 mas plx Hipparcos parallax 80- 83 F4.1 mas e_plx Uncertainty in plx 85- 92 A8 mag JMAG Absolute 2MASS J-band magnitude 94-105 A12 --- Comm Additional comments 107-112 A6 --- Note Note number (see file notes.dat)
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 5 I5 --- rNLTT NLTT number 7- 16 A10 --- Name Name 18- 19 I2 h RAh Hour of right ascension (J2000) 21- 22 I2 min RAm Minute of right ascension (J2000) 24- 28 F5.2 s RAs Second of right ascension (J2000) 30 A1 --- DE- Sign of the declination (J2000) 31- 32 I2 deg DEd Degree of declination (J2000) 34- 35 I2 arcmin DEm Arcminute of declination (J2000) 37- 41 F5.2 arcsec DEs Arcsecond of declination (J2000) 42- 50 A9 mag Vmag V magnitude 52- 56 F5.3 mag Jmag J magnitude 58- 62 F5.3 mag Hmag H magnitude 64- 68 F5.3 mag Ksmag Ks magnitude 70- 71 I2 mas plx Trigonometric parallax 73- 74 I2 mas e_plx Error in plx 76- 84 A9 mag JMAG Absolute J magnitude 86- 91 A6 --- Note Additional comments (see file notes.dat)
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 19 A19 --- Comm Comment about the origin 21- 32 A12 --- Name Object name 34- 35 A2 --- --- [2M] 36- 49 A14 --- 2MASS 2MASS identification number (HHMMSSs+DDMMSS) 51- 55 F5.2 mag Vmag The V-band magnitude 57- 61 F5.2 mag Jmag The J-band magnitude 63- 66 F4.2 mag e_Jmag Uncertainty in Jmag 68- 72 F5.2 mag Hmag The H-band magnitude 74- 77 F4.2 mag e_Hmag Uncertainty in Hmag 79- 83 F5.2 mag Ksmag The Ks band magnitude 85- 88 F4.2 mag e_Ksmag Uncertainty in Ksmag 90- 93 A4 --- SpType MK Spectral type (1) 95- 99 F5.2 mag m-M Distance modulus 101-104 F4.2 mag e_m-M Uncertainty in m-M 106-114 A9 --- Note Additional comments (see file notes.dat)
Note (1): Spectral types are taken from the PMSU for M dwarfs, and from either the CNS3 (Cat. V/70) or SIMBAD for earlier-type stars.
Global Notes: Note (G1): We have added Lowell Observatory Proper Motion Survey identifications (Giclas et al. 1971, Cat. I/79) where appropriate. R = Ross; W = Wolf; Oxf = Oxford catalog. Note (G2): Flag on Name, defined as follows: ** = Star with formal distance estimate d≤20pc; * = Star with formal distance estimate within 1σ of 20pc. Note (G3): Usually from either the CNS3 (Cat. V/70) or the LHS Catalogue (Cat. I/279).
History: From electronic version of the journal References: Reid & Cruz, Paper I, 2002AJ....123.2806R, Cat. J/AJ/123/2806 Reid et al., Paper II, 2002AJ....123.2822R, Cat. J/AJ/123/2822 Cruz & Reid, Paper III, 2002AJ....123.2828C, Cat. J/AJ/123/2828 Reid et al., Paper IV, 2003AJ....125..354R Cruz et al., Paper V, 2003AJ....126.2421C, Cat. J/AJ/126/2421 Reid, Paper VI, 2003AJ....126.2449R, Cat. J/AJ/126/2449 Reid et al., Paper VII, 2003AJ....126.3007R, Cat. J/AJ/126/3007
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 04-Oct-2005
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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