J/AJ/123/2806 Nearby stars in the NLTT catalogue (Reid+, 2002)
Meeting the cool neighbors.
I. Nearby stars in the NLTT catalogue: defining the sample.
Reid I.N., Cruz K.L.
<Astron. J. 123, 2806 (2002)>
=2002AJ....123.2806R 2002AJ....123.2806R
ADC_Keywords: Stars, nearby ; Stars, distances ; Parallaxes, trigonometric ;
Photometry, infrared
Keywords: Galaxy: stellar content - stars: late-type
Abstract:
We 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 mr 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
(MV, V-K), (MV, V-I), and (MI, 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 1σ 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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 196 6 Photometric outliers
table2.dat 86 13 Close binary stars in the final sample
table3.dat 120 455 Photometry and astrometry of NLTT stars
ref3.dat 199 23 References for optical observations in table3.dat
table4.dat 100 469 Distance modulus estimates for NLTT stars
table6.dat 90 9 Spectroscopically confirmed ultracool dwarfs
table7.dat 87 42 Photometrically selected ultracool dwarfs
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See also:
B/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)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- NLTT Designation from the NLTT I/98 Catalogue
17- 18 I2 h RAh Right ascension (J2000.0)
20- 21 I2 min RAm Right ascension (J2000.0)
23- 26 F4.1 s RAs Right ascension (J2000.0)
28 A1 --- DE- Declination sign (J2000.0)
29- 30 I2 deg DEd Declination (J2000.0)
32- 33 I2 arcmin DEm Declination (J2000.0)
35- 36 I2 arcsec DEs Declination (J2000.0)
38- 41 F4.1 mag rmag r magnitude
43- 46 F4.2 mag r-Ks ? r-Ks colour index
48- 52 F5.2 mag J-H J-H colour index
54- 58 F5.2 mag H-Ks ? H-Ks colour index
60- 64 F5.1 mas plx Photometric parallax
66- 69 F4.1 mas e_plx rms uncertainty on plx
72- 75 F4.2 mag KsMAG ? Ks absolute magnitude
77-196 A120 --- Notes Individual notes
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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- 15 A15 --- NLTT Designation from the NLTT I/98 Catalogue
17- 25 A9 --- Name Other name
26 A1 --- n_Name Individual note (1)
28- 29 I2 h RAh Right ascension (J2000.0)
31- 32 I2 min RAm Right ascension (J2000.0)
34- 37 F4.1 s RAs Right ascension (J2000.0)
39 A1 --- DE- Declination sign (J2000.0)
40- 41 I2 deg DEd Declination (J2000.0)
43- 44 I2 arcmin DEm Declination (J2000.0)
46- 47 I2 arcsec DEs Declination (J2000.0)
49- 52 F4.1 mag rmag r magnitude
54- 58 F5.3 mag Jmag ? J magnitude
60- 64 F5.3 mag Hmag ? H magnitude
66- 70 F5.3 mag Ksmag Ks magnitude
72- 76 F5.1 mas plx ? Trigonometric parallax
78- 81 F4.1 mas e_plx ? rms uncertainty on plx
83 I1 --- r_plx ? Parallax reference (2)
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Note (1): *: Gl 278C is the well-known eclipsing binary YY Geminorum.
Note (2): References are numbered as follows:
1 = Hipparcos, Cat. I/239
2 = Yale catalog, van Altena et al, 1995, Cat. I/238
3 = Yale parallax for primary star
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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- 15 A15 --- NLTT The designation from the NLTT Catalogue (1)
17- 25 A9 --- AName Alternative name (2)
27- 31 A5 --- LHS ? Designation in Luyten's LHS catalog
32- 33 I2 h RAh Hour of Right Ascension from 2MASS (J2000)
35- 36 I2 min RAm Minute of Right Ascension from 2MASS (J2000)
38- 41 F4.1 s RAs Second of Right Ascension from 2MASS (J2000)
43 A1 --- DE- Sign of the Declination from 2MASS (J2000)
44- 45 I2 deg DEd Degree of Declination from 2MASS (J2000)
47- 48 I2 arcmin DEm Arcminute of Declination from 2MASS (J2000)
50- 51 I2 arcsec DEs Arcsecond of Declination from 2MASS (J2000)
53- 56 F4.1 mag rmag The NLTT r-band magnitude
58- 62 F5.2 mag Vmag The V-band magnitude
64- 67 F4.2 mag B-V ? The (B-V) color on the Johnson system
69- 72 F4.2 mag V-R ? The (V-R) color on the Cousins system
74- 77 F4.2 mag V-I ? The (V-I) color on the Cousins system
79- 83 A5 --- r_Vmag ? References for the optical observations,
separated by comma, in ref3.dat file
85- 90 F6.3 mag Jmag ? The 2MASS J-band magnitude
92- 97 F6.3 mag Hmag ? The 2MASS H-band magnitude
99-104 F6.3 mag Ksmag The 2MASS KS band magnitude
106-110 F5.1 mas plx ? Trigonometric parallax
112-116 F5.2 mas e_plx ? Uncertainty in plx
118-120 A3 --- r_plx Source of the astrometry (4)
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Note (1): We have added Lowell Observatory Proper Motion Survey identifications
(Giclas et al., 1971, Cat. I/79) where appropriate.
R = Ross catalog;
W = Wolf catalog;
Oxf = Oxford catalog.
Note (2): Usually from the preliminary version of the Third Catalogue
of Nearby Stars (Jahreis & Gliese, 1991, Cat. V/70: pCNS3).
Note (4): Source of the astrometry are numbered as follows:
1 = Hipparcos (ESA 1997, Cat. I/239)
1.5 = Hipparcos data for the primary in a multiple system
2 = Yale catalog, van Altena et al. (1995, Cat. I/238)
2.5 = Yale catalog data for the primary in a multiple system
3 = Tinney (1996MNRAS.281..644T 1996MNRAS.281..644T)
4 = USNO (Dahn et al. 2000, in ASP Conf. Ser. 212, From Giant Planets
to Cool Stars, ed. C. Griffith & M. Marley (San Francisco: ASP), 74)
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Byte-by-byte Description of file: ref3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode BibCode
23- 42 A20 --- Aut Author's name
44-198 A155 --- Com Comments
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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- 15 A15 --- NLTT Designation from the NLTT I/98 Catalogue (1)
16 A1 --- n_NLTT [*] Flag not explicited in the paper
17- 21 F5.2 mag DM(V-Ks) Distance modulus derived from (V-KS)
photometric parallax
23- 26 F4.2 mag e_DM(V-Ks) Uncertainty in DM(V-K)
28- 32 F5.2 mag DM(V-Ic) ? Distance modulus derived from (V-Ic)
photometric parallax
34- 37 F4.2 mag e_DM(V-Ic) ? Uncertainty in DM(V-Ic)
39- 45 F7.2 mag DM(Ic-J) ? Distance modulus derived from (Ic-J)
photometric parallax
48- 51 F4.2 mag e_DM(Ic-J) ? Uncertainty in DM(Ic-J)
53- 58 F6.2 mag DM Weighted Distance modulus average
60- 63 F4.2 mag e_DM Uncertainty in DM
65- 69 F5.2 mag DMplx ? Distance modulus from trigonometric parallax
71- 74 F4.2 mag e_DMplx ? Uncertainty in DMplx
76- 80 F5.1 pc Dist Final weighted average distance (2)
82- 85 F4.1 pc e_Dist Uncertainty in Dist
87- 91 F5.2 mag KsMAG Absolute KS band magnitude
93- 97 F5.2 mag VMAG Absolute V band magnitude
99-100 A2 --- DistLim Distance limit (20pc) code (3)
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Note (1): Adding Lowell Observatory identifications.
Note (2): Based on a weighted average of the photometric average and the
trigonometric result.
Note (3): Distance limits are coded as follows:
Y = star lies within our distance limit of 20 pc;
? = within 1σ of the boundary;
N = beyond the limit;
+ = indicates that the star is not included in the preliminary version
of the Third Catalogue of Nearby Stars
(Jahreis & Gliese, 1991NSC3..C......0G 1991NSC3..C......0G).
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- NLTT Designation from the NLTT I/98 Catalogue
17- 18 I2 h RAh Right ascension (J2000.0)
20- 21 I2 min RAm Right ascension (J2000.0)
23- 26 F4.1 s RAs Right ascension (J2000.0)
28 A1 --- DE- Declination sign (J2000.0)
29- 30 I2 deg DEd Declination (J2000.0)
32- 33 I2 arcmin DEm Declination (J2000.0)
35- 36 I2 arcsec DEs Declination (J2000.0)
38- 41 F4.1 mag rmag r magnitude
43- 47 F5.2 mag Icmag ? Cousins I magnitude
49- 52 A4 --- SpType Spectral type
54- 59 F6.3 mag Jmag ? J magnitude
61- 66 F6.3 mag Hmag ? H magnitude
68- 73 F6.3 mag Ksmag Ks magnitude
75- 78 F4.1 pc Dist Spectroscopic distance
80- 82 F3.1 pc e_Dist rms uncertainty on Dist
84 I1 --- r_Dist ? Distance reference (1)
86- 90 F5.2 mag KMAG Absolute K magnitude
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Note (1): References are numbered as follows:
1 = Scholz et al., 2001A&A...374L..12S 2001A&A...374L..12S, LHS 2090: distance from J-Ks
2 = Ardila et al., 2000AJ....120..479A 2000AJ....120..479A, UScoCTIO 4: distance from I-J
3 = Gizis et al., 2000MNRAS.311..385G 2000MNRAS.311..385G: distance from J-Ks
4 = Gizis et al., 2000AJ....120.1085G 2000AJ....120.1085G: distance from J-Ks;
LP 315-53 = LHS 2243
5 = Tinney, 1996MNRAS.281..644T 1996MNRAS.281..644T, 1998MNRAS.296L..42T 1998MNRAS.296L..42T:
distance from trigonometric parallax
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- NLTT Designation from the NLTT I/98 Catalogue
17- 20 I4 --- LHS ? The LHS (Cat. I/87) number
22- 23 I2 h RAh Hour of Right Ascension from 2MASS (J2000)
25- 26 I2 min RAm Minute of Right Ascension from 2MASS (J2000)
28- 31 F4.1 s RAs Second of Right Ascension from 2MASS (J2000)
33 A1 --- DE- Sign of the Declination from 2MASS (J2000)
34- 35 I2 deg DEd Degree of Declination from 2MASS (J2000)
37- 38 I2 arcmin DEm Arcminute of Declination from 2MASS (J2000)
40- 41 I2 arcsec DEs Arcsecond of Declination from 2MASS (J2000)
43- 46 F4.1 mag rmag The NLTT r-band magnitude
48- 53 F6.3 mag Jmag The 2MASS J-band magnitude
55- 60 F6.3 mag Hmag The 2MASS H-band magnitude
62- 67 F6.3 mag Ksmag The 2MASS KS band magnitude
69- 73 F5.2 mag KSMAG The Absolute KS band magnitude
75- 78 F4.1 pc Dist Photometric distance (1)
80- 82 F3.1 pc e_Dist Uncertainty in Dist
84- 87 F4.1 pc ODist ? Distance from table2.dat (2)
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Note (1): Based on the (MK, (J-KS)) calibration given in the text.
Note (2): For stars with optical photometry.
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History:
* 21-Jun-2002: From electronic version of the journal
* 31-May-2003: Several errors corrected:
Errors in Table 3 (the * means that the error also existed in Table 4):
706- 69 : G number is 270-102, not 170-102
G 72-23 : LHS is 5037a (the 'a' was missing)
*G 271-66: is G 271-166
593- 68 : Declination is -00 52 44 (the minus was missing also in table7)
*G 39-44 : is G 39-34
17-243 : is LHS 5126a (the 'a' was missing)
G 47-28 : is LHS 5146a (the 'a' was missing)
*+35:2409: is +35:2439 (Gl 508.2)
*G 205-28: appears twice, the second is G 205-48
Error in table4 (in addition to those marked by an *):
G32-50 : is G 69-24
* 23-Jun-2005: Several errors corrected:
G 47-28 : LHS 5146a corrected into LHS 5146b
*G 139-29 : G 139-29 corrected into G 139-39
G 131-5 : The cross-identifications USNO 497 and LHS 17 were suppressed,
because they don't correspond to the G 131-5 position.
References:
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
Cruz et al., Paper V, 2003AJ....126.2421C 2003AJ....126.2421C, Cat. J/AJ/126/2421
Reid, Paper VI, 2003AJ....126.2449R 2003AJ....126.2449R, Cat. J/AJ/126/2449
Reid et al., Paper VII, 2003AJ....126.3007R 2003AJ....126.3007R, Cat. J/AJ/126/3007
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 Bauer [CDS] 21-Jun-2002