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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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)
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
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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)
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) 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)
Byte-by-byte Description of file: ref3.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference code 4- 22 A19 --- BibCode BibCode 23- 42 A20 --- Aut Author's name 44-198 A155 --- Com Comments
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
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)
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).
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
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
Note (1): References are numbered as follows: 1 = Scholz et al., 2001A&A...374L..12S, LHS 2090: distance from J-Ks 2 = Ardila et al., 2000AJ....120..479A, UScoCTIO 4: distance from I-J 3 = Gizis et al., 2000MNRAS.311..385G: distance from J-Ks 4 = Gizis et al., 2000AJ....120.1085G: distance from J-Ks; LP 315-53 = LHS 2243 5 = Tinney, 1996MNRAS.281..644T, 1998MNRAS.296L..42T: distance from trigonometric parallax
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
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)
Note (1): Based on the (MK, (J-KS)) calibration given in the text. Note (2): For stars with optical photometry.
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, 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 Reid et al., Paper VIII, 2004AJ....128..463R, Cat. J/AJ/128/463
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 21-Jun-2002
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