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J/AJ/126/3007       Spectroscopy of faint red NLTT dwarfs    (Reid+, 2003)

Meeting the cool neighbors. VII. Spectroscopy of faint red NLTT dwarfs. 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. <Astron. J., 126, 3007-3016 (2003)> =2003AJ....126.3007R
ADC_Keywords: Stars, late-type ; Photometry, infrared ; Stars, distances Keywords: Galaxy: stellar content - solar neighborhood - stars: distances - stars: late-type Abstract: We present low-resolution optical spectroscopy and BVRI photometry of 453 candidate nearby stars drawn from the NLTT (I/98) proper-motion catalog. The stars were selected based on optical/near-infrared colors, derived by combining the NLTT photographic data with photometry from the 2MASS Second Incremental Data Release (II/241). Based on the derived photometric and spectroscopic parallaxes, we identify 111 stars as lying within 20pc of the Sun, including nine stars with formal distance estimates of less than 10pc. A further 53 stars have distance estimates within 1σ of our 20pc limit. Almost all of those stars are additions to the nearby-star census. In total, our NLTT-based survey has so far identified 496 stars likely to be within 20pc, of which 195 are additions to nearby-star catalogs. Most of the newly identified nearby stars have spectral types between M4 and M8. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 82 13 Ultracool NLTT1 dwarfs in Paper V (J/AJ/126/2124) table2.dat 121 357 Astrometry and photometry of spectroscopic targets notes.dat 80 50 Notes table3.dat 59 357 Narrowband indices for NLTT dwarfs table4.dat 117 96 Photometry of NLTT dwarfs
See also: V/70 : Nearby Stars, Preliminary 3rd Version (Gliese+ 1991) I/98 : NLTT Catalogue (Luyten, 1979) II/241 : 2MASS Catalog Intermediate Data Release (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/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/ApJ/582/1011 : Revised NLTT Catalog (Salim+, 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) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Star Name 14- 15 I2 h RAh Right ascension (J2000.0) 17- 18 I2 min RAm Right ascension (J2000.0) 20- 23 F4.1 s RAs Right ascension (J2000.0) 25 A1 --- DE- Declination sign (J2000.0) 26- 27 I2 deg DEd Declination (J2000.0) 29- 30 I2 arcmin DEm Declination (J2000.0) 32- 33 I2 arcsec DEs Declination (J2000.0) 35- 38 F4.1 mag rmag NLTT red magnitude 40- 45 F6.3 mag Jmag 2MASS J magnitude 47- 52 F6.3 mag Hmag 2MASS H magnitude 54- 59 F6.3 mag Ksmag 2MASS Ks magnitude 61- 64 F4.1 pc Dist Heliocentric Distance 66- 68 F3.1 pc e_Dist rms uncertainty on Dist 70- 74 F5.2 mag JMAG Absolute J magnitude 76- 79 A4 --- SpType Spectral type 81- 82 I2 --- n_Name Note, detailed in notes.dat file
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name The NLTT object name 14- 15 A2 --- f_Name Flag on Name (1) 17- 18 I2 h RAh Hour of Right Ascension (J2000) 20- 21 I2 min RAm Minute of Right Ascension (J2000) 23- 26 F4.1 s RAs Second of Right Ascension (J2000) 28 A1 --- DE- Sign of the Declination (J2000) 29- 30 I2 deg DEd Degree of Declination (J2000) 32- 33 I2 arcmin DEm Arcminute of Declination (J2000) 35- 36 I2 arcsec DEs Arcsecond of Declination (J2000) 38- 41 F4.1 mag rmag The NLTT r band magnitude 43- 48 F6.3 mag Jmag The 2MASS J band magnitude 50- 55 F6.3 mag Hmag The 2MASS H band magnitude 57- 62 F6.3 mag Ksmag The 2MASS Ks band magnitude 64- 68 F5.2 mag JMAG The absolute 2MASS J band magnitude 70- 74 F5.1 pc Dist Heliocentric Distance 76- 79 F4.1 pc e_Dist Error in Dist 81-102 A22 --- Com Comments 104-108 A5 --- n_Name Additional notes, in notes.dat file
Note (1): Flag on Name: **: stellar system with formal distance estimate Dist<20pc. *: stellar system with formal distance estimate within 1σ of our 20pc limit.
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Note Note number 3- 80 A78 --- Text Text of the note
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name The NLTT object name 14- 17 F4.2 --- TiO5 The TiO 5 spectral index (1) 19- 23 F5.2 --- CaOH ? The CaOH spectral index (2) 25- 28 F4.2 --- CaH1 ? The CaH 1 spectral index (3) 30- 33 F4.2 --- CaH2 The CaH 2 spectral index (4) 35- 38 F4.2 --- CaH3 The CaH 3 spectral index (5) 40- 43 F4.2 --- TiO-a The TiO-a spectral index (6) 45- 48 F4.2 --- VO-a The VO-a spectral index (7) 50- 53 F4.2 --- Ha The Halpha spectral index (8) 55- 58 A4 --- SpType Spectral type
Note (1): Defined as the 7126-7135Å flux divided by the 7042-7046Å flux. Note (2): Defined as the 6230-6240Å flux divided by the 6345-6354Å flux. Note (3): Defined as the 6380-6390Å flux divided by the average of the 6345-6355Å & 6410-6430Å flux. Note (4): Defined as the 6814-6846Å flux divided by the 7042-7046Å flux. Note (5): Defined as the 6960-6990Å flux divided by the 7042-7046Å flux. Note (6): Defined as the 7033-7048Å flux divided by the 7058-7073Å flux. Note (7): Defined as the sum of the 7350-7370Å & 7550-7570Å flux divided by the 7430-7470Å flux. Note (8): Defined as the 6560-6566Å flux divided by the 6545-6555Å flux.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name The NLTT object name 13- 14 I2 --- n_Name ? Note on Name, in notes.dat file 16- 17 I2 h RAh Hour of Right Ascension (J2000) 19- 20 I2 min RAm Minute of Right Ascension (J2000) 22- 25 F4.1 s RAs Second of Right Ascension (J2000) 27 A1 --- DE- Sign of the Declination (J2000) 28- 29 I2 deg DEd Degree of Declination (J2000) 31- 32 I2 arcmin DEm Arcminute of Declination (J2000) 34- 35 I2 arcsec DEs Arcsecond of Declination (J2000) 37- 42 F6.3 mag Vmag The V band magnitude 43 A1 --- u_Vmag Uncertainty flag in Vmag 45- 49 F5.3 mag B-V ? The (B-V) color 50 A1 --- u_B-V Uncertainty flag in B-V 52- 56 F5.3 mag V-R The (V-R) color 57 A1 --- u_V-R Uncertainty flag in V-R 59- 63 F5.3 mag V-I The (V-I) color 64 A1 --- u_V-I Uncertainty flag in V-I 66 I1 --- Nobs Number of observations 68- 69 I2 mmag e_Vmag ? Formal residual about the mean in Vmag 71- 72 I2 mmag e_B-V ? Formal residual about the mean in B-V 74- 75 I2 mmag e_V-R ? Formal residual about the mean in V-R 77- 78 I2 mmag e_V-I ? Formal residual about the mean in V-I 80- 85 F6.3 mag Jmag The 2MASS J band magnitude 86 A1 --- u_Jmag Uncertainty flag in Jmag 88- 93 F6.3 mag Hmag The 2MASS H band magnitude 94 A1 --- u_Hmag Uncertainty flag in Hmag 96-100 F5.3 mag Ksmag The 2MASS Ks band magnitude 101 A1 --- u_Ksmag Uncertainty flag in Ksmag 103-106 F4.2 mag JMAG Derived absolute 2MASS J band magnitude 108-111 F4.2 mag e_JMAG Error in JMAG 113-116 F4.1 pc Dist Heliocentric Distance
History: From electronic version of the journal * 15-Nov-2004: table2, declination of LDS3284B (minus sign was missing) 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 Reid et al., Paper V 2003AJ....126.2421R, Cat. J/AJ/126/2421 Reid, Paper VI 2003AJ....126.2449R, Cat. J/AJ/126/2449 Reid et al., Paper VIII, 2004AJ....128..463R, Cat. J/AJ/128/463
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 12-Jan-2004
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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