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 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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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
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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.
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Note Note number
3- 80 A78 --- Text Text of the note
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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 Hα spectral index (8)
55- 58 A4 --- SpType Spectral type
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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.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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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
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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 2002AJ....123.2806R, Cat. J/AJ/123/2806
Reid et al., Paper II 2002AJ....123.2822R 2002AJ....123.2822R, Cat. J/AJ/123/2822
Cruz & Reid, Paper III 2002AJ....123.2828C 2002AJ....123.2828C, Cat. J/AJ/123/2828
Reid et al., Paper IV 2003AJ....125..354R 2003AJ....125..354R
Reid et al., Paper V 2003AJ....126.2421R 2003AJ....126.2421R, Cat. J/AJ/126/2421
Reid, Paper VI 2003AJ....126.2449R 2003AJ....126.2449R, Cat. J/AJ/126/2449
Reid et al., Paper VIII, 2004AJ....128..463R 2004AJ....128..463R, Cat. J/AJ/128/463
Cruz et al., Paper IX, 2007AJ....133..439C 2007AJ....133..439C, Cat. J/AJ/133/439
Reid et al., Paper X, 2008AJ....136.1290R 2008AJ....136.1290R, Cat. J/AJ/136/1290
Reid et al., Paper XI, 2007AJ....133.2825R 2007AJ....133.2825R, Cat. J/AJ/133/2825
Cruz et al., Paper XII, 2018AJ....155...34C 2018AJ....155...34C
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 12-Jan-2004