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J/AJ/123/2822       Photometry of southern NLTT stars        (Reid+, 2002)

Meeting the cool neighbors. II. Photometry of southern NLTT stars. Reid I.N., Kilkenny D., Cruz K.L. <Astron. J. 123, 2822 (2002)> =2002AJ....123.2822R
ADC_Keywords: Stars, nearby ; Photometry, UBVRI ; Stars, distances Keywords: Galaxy: stellar content - stars: red dwarfs Abstract: We present BVRI photometry of 180 bright, southern nearby-star candidates. The stars were selected from the New Luyten Two-Tenths proper-motion catalog (Cat. I/98) based on optical/infrared colors, constructed by combining Luyten's mr estimates with near-infrared photometry from the Two Micron All Sky Survey (Cat. <B/2mass>) . Photometric parallaxes derived from V-Ks, V-I, and I-J colors, combined with the limited available astrometry, show that as many as 108 stars may lie within 20pc of the Sun. Of these, 53 are new to nearby-star catalogs, including three within 10pc of the Sun. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 109 180 Photometry and Astrometry of NLTT Stars table3.dat 92 180 Distance Modulus Estimates for NLTT Stars
See also: B/2mass : The 2MASS database (IPAC/UMass, 2000) I/98 : NLTT Catalogue (Luyten, 1979) I/87 : LHS Catalogue, 2nd Edition (Luyten 1979) V/70 : Nearby Stars, Preliminary 3rd Version (Gliese+ 1991) J/AJ/123/2806 : Nearby stars in the NLTT catalogue (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- 12 A12 --- NLTT Designation from the NLTT I/98 Catalogue (1) 14- 16 A3 --- f_NLTT [1234, ] Flag on NLTT (2) 18- 26 A9 --- AName Alternative name (3) 28- 31 I4 --- LHS ? Designation from Luyten's LHS catalog 33- 34 I2 h RAh Hour of Right Ascension from 2MASS (J2000) 36- 37 I2 min RAm Minute of Right Ascension from 2MASS (J2000) 39- 42 F4.1 s RAs Second of Right Ascension from 2MASS (J2000) 44 A1 --- DE- Sign of the Declination from 2MASS (J2000) 45- 46 I2 deg DEd Degree of Declination from 2MASS (J2000) 48- 49 I2 arcmin DEm Arcminute of Declination from 2MASS (J2000) 51- 52 I2 arcsec DEs Arcsecond of Declination from 2MASS (J2000) 54- 57 F4.1 mag rmag The NLTT r-band magnitude 59- 63 F5.2 mag Vmag The V-band magnitude 65- 68 F4.2 mag B-V ? The (B-V) color on the Johnson system 70- 73 F4.2 mag V-Rc ? The (V-Rc) color on the Cousins system 75- 78 F4.2 mag V-Ic ? The (V-Ic) color on the Cousins system 80 I1 --- Nobs ? Number of optical observations 82- 87 F6.3 mag Jmag The 2MASS J-band magnitude 89- 93 F5.3 mag Hmag ? The 2MASS H-band magnitude 95- 99 F5.3 mag Kmag The 2MASS KS band magnitude 101-103 I3 mas plx ? Trigonometric parallax 105-106 I2 mas e_plx ? Uncertainty in plx 108 A1 --- r_plx Source of the astrometry (4)
Note (1): We have added Lowell Observatory identifications (Giclas et al., 1971, Cat. I/79) R = Ross catalog W = Wolf catalog Note (2): Flag on NLTT: 1 = (B-V) too blue for VRIJHK, possibly due to contamination; 2 = possible variable; 3 = Joint optical photometry for known binary: Ross 948/LP 735-11 - Rmag(A)=11.0, Rmag(B)=11.3, Δ=4" LP 793-24/25 - Rmag(A)=11.9, Rmag(B)=12.2, Δ=4.5" LP 675-76/77 - Rmag(A)=12.7, Rmag(B)=13.0, Δ=8" LP 726-11/12 - Rmag(A)=12.7, Rmag(B)=13.6, Δ=8" 4 = Two stars in aperture for optical photometry; in most cases, the second star is too faint to affect the VRI data. Note (3): Usually from the preliminary version of the Third Catalogue of Nearby Stars (Jahreis & Gliese, 1991, Cat. V/70) Note (4): Source of the astrometry: 1 = Hipparcos (ESA 1997, Cat. I/239) 2 = pCNS3; Jahreis & Gliese, 1991, Cat. V/70) 3 = USNO (Monet et al., 1992, Cat. J/AJ/103/638; Harrington et al., 1993, Cat. J/AJ/105/1571)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 12 A12 --- NLTT The designation from the NLTT Catalogue (1) 13 I1 --- f_NLTT [1]? Flag on NLTT (2) 15- 19 F5.2 mag DM(V-Ks) Distance modulus derived from (V-Ks) photometric parallax 21- 24 F4.2 mag e_DM(V-Ks) Uncertainty in DM(V-Ks) 26- 30 F5.2 mag DM(V-Ic) ? Distance modulus derived from (V-Ic) photometric parallax 32- 35 F4.2 mag e_DM(V-Ic) ? Uncertainty in DM(V-Ic) 37- 41 F5.2 mag DM(Ic-J) ? Distance modulus derived from (Ic-J) photometric parallax 43- 46 F4.2 mag e_DM(Ic-J) ? Uncertainty in DM(Ic-J) 48- 52 F5.2 mag DM Weighted photometric parallax average 54- 57 F4.2 mag e_DM Uncertainty in DM 59- 63 F5.2 mag DMplx ? Distance modulus from trigonometric parallax 65- 68 F4.2 mag e_DMplx ? Uncertainty in DMplx 70- 73 F4.1 pc Dist Final weighted average distance (3) 75- 77 F3.1 pc e_Dist Uncertainty in Dist 79- 82 F4.2 mag KsMAG Absolute Ks band magnitude 84- 88 F5.2 mag VMag Absolute V band magnitude 90- 91 A2 --- f_Dist Distance limit code (4)
Note (1): Adding Lowell Observatory identifications. Note (2): Flag on NLTT: 1: Binary stars where we have joint photometry for both components. We have used the NLTT magnitudes to estimate the relative contribution, and the distance and absolute magnitudes are based on the estimated optical/near-infrared colors of the primary. Note (3): Based on a weighted average of the photometric average and the trigonometric result. Note (4): Distance limit code: Y: star lies within our distance limit of 20pc; ?: 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, Cat. V/70).
History: From electronic version of the journal * 05-May-2003: Corrected in table1 the declination sign for G 75-55 and LP 616- 56 (missing minus) LP 595- 23 (declination is positive) References: Reid & Cruz, Paper I, 2002AJ....123.2806R, Cat. J/AJ/123/2806 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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