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J/AJ/126/2449       Nearby ultracool dwarfs in galactic plane      (Reid+, 2003)

Meeting the cool neighbors. VI. A search for nearby ultracool dwarfs in the galactic plane. Reid I.N. <Astron. J., 126, 2449-2461 (2003)> =2003AJ....126.2449R
ADC_Keywords: Stars, dwarfs ; Stars, late-type ; Photometry, infrared ; Stars, nearby Keywords: Galaxy: stellar content - stars: low-mass, brown dwarfs - stars: luminosity function, mass function Abstract: Surveys for nearby low-luminosity dwarfs tend to avoid the crowded regions of the Galactic plane. We have devised near-infrared color-magnitude and color-color selection criteria designed to identify late-type M and early-type L dwarfs within 12pc of the Sun. We use those criteria to search for candidates within the regions of the Galactic plane (|b|<10°) covered by the Second Incremental Data Release from the Two Micron All Sky Survey (II/241). Detailed inspection of the available photographic images of the resulting 1299 candidates confirms only two as ultracool dwarfs. Both are known proper-motion stars, identified in the recent survey by Lepine et al. (2003, Cat. J/AJ/125/1598). Despite the low numbers, the inferred surface density is consistent with comparable surveys at higher latitudes. We discuss the implications for the luminosity function and consider means of improving the efficiency and scope of photometric surveys in the plane. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 91 101 Ultracool dwarf candidates with |b|<10° table2.dat 99 31 Ultracool candidates from Luyten's surveys table3.dat 94 61 2MASS data for LSR proper motion stars
See also: II/241 : 2MASS Catalog Intermediate Data Release (IPAC/UMass, 2000) I/98 : NLTT Catalogue (Luyten, 1979) 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/126/3007 : 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- 2 I2 h RAh Hour of Right Ascension (J2000) 4- 5 I2 min RAm Minute of Right Ascension (J2000) 7- 11 F5.2 s RAs Second of Right Ascension (J2000) 13 A1 --- DE- Sign of the Declination (J2000) 14- 15 I2 deg DEd Degree of Declination (J2000) 17- 18 I2 arcmin DEm Arcminute of Declination (J2000) 20- 23 F4.1 arcsec DEs Arcsecond of Declination (J2000) 25- 30 F6.3 mag Jmag The 2MASS J band magnitude 32- 36 F5.3 mag e_Jmag Error in Jmag 38- 43 F6.3 mag Hmag The 2MASS H band magnitude 45- 49 F5.3 mag e_Hmag Error in Hmag 51- 56 F6.3 mag Ksmag The 2MASS Ks band magnitude 58- 62 F5.3 mag e_Ksmag Error in Kmag 64- 90 A27 --- Comm Additional comments
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 I5 --- NLTT NLTT (Cat. I/98) number 7- 17 A11 --- Name Other name 19- 20 I2 h RAh Right ascension (J2000.0) 22- 23 I2 min RAm Right ascension (J2000.0) 25- 28 F4.1 s RAs Right ascension (J2000.0) 30 A1 --- DE- Declination sign (J2000.0) 31- 32 I2 deg DEd Declination (J2000.0) 34- 35 I2 arcmin DEm Declination (J2000.0) 37- 38 I2 arcsec DEs Declination (J2000.0) 40- 42 I3 deg GLAT Galactic latitude 44- 47 F4.1 mag rmag ? Red magnitude from NLTT (I/98) or LHS (I/87) 49- 53 F5.2 mag Jmag 2MASS J magnitude 55- 58 F4.2 mag J-H 2MASS J-H colour index 60- 63 F4.2 mag H-Ks 2MASS H-Ks colour index 65- 68 A4 --- SpType Spectral type 70- 72 A3 --- Sel [Yes No] Indicates whether the (J-H, H-Ks) colors meet our criteria 74- 99 A26 --- Com Comments (1)
Note (1): Notes on individual stars: 1: Cataloged by Gizis, Reid, & Hawley, 2002, Cat. J/AJ/123/3356 2: Included in Paper III of the present series (Cruz & Reid, 2002, Cat. J/AJ/123/2828) 3: Identified as a nearby star in Paper III, Cruz et al., 2002, Cat. J/AJ/123/2828 and by McCaughrean, Scholz, & Lodieu, 2002A&A...390L..27M 4: Binary star with separation 5; 2MASS photometry unreliable. 5: Binary companion of LP 375-27 (mr=12.0), Δ=3"; 2MASS photometry unreliable. 6: Binary companion of G148-8 (mr=14.9), Δ=4.5"; 2MASS photometry unreliable. 7: Binary companion of BD+25 2621 (mr=11.0), Δ=4"; 2MASS photometry unreliable. 8: Misidentification; no evidence of motion, probably a background giant. 9: LP 862-26 is not an M dwarf. 10: Inconsistent optical and infrared photometry; both stars are merged with red field stars in the 2MASS scans. 11: Not identified as a binary by Luyten, but clearly elongated on both UKST/SERC and 2MASS images; 2MASS photometry unreliable. 12: Merged with a field star in the 2MASS scans, and photometry correspondingly unreliable. UBV photometry by Ryan (1992AJ....104.1144R) indicates G-type colors. Note that SIMBAD has separate listings for this star under the LP and Lowell names. 13: Binary companion of LP 878-90 (mr=14.2), Δ=4"; 2MASS photometry unreliable. 14: Binary companion of BD-10 6203A (mr=7.8), Δ=3"; 2MASS photometry unreliable.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [LSR] 4- 13 A10 --- LSR Name in LSR (Cat. J/AJ/124/1190) 15- 18 F4.1 mag Rmag The R band magnitude 20- 23 F4.2 mag R-J ? The (R-J) color 25 A1 --- l_Jmag Limit flag on Jmag 26- 31 F6.3 mag Jmag The 2MASS J band magnitude 33- 37 F5.3 mag e_Jmag ? Error in Jmag 39 A1 --- l_Hmag Limit flag on Hmag 40- 45 F6.3 mag Hmag The 2MASS H band magnitude 47- 51 F5.3 mag e_Hmag ? Error in Hmag 53 A1 --- l_Ksmag Limit flag on Ksmag 54- 59 F6.3 mag Ksmag The 2MASS Ks band magnitude 61- 65 F5.3 mag e_Ksmag ? Error in Ksmag 67- 71 F5.2 --- HR The R-band reduced proper motion H = Rmag + 5 + 5logµ 73- 80 A8 --- Class Classification 82- 93 A12 --- Com Additional comments (1)
Note (1): Spectral types are taken from Lepine, Rich & Shara (2003, Cat. J/AJ/125/1598), except for LSR0510, LSR0539, LSR0602 (this paper) and LSR1835 (Reid et al., 2003AJ....125..354R) 1 = These white dwarfs lie within the area covered by the 2MASS Second Incremental Data Release, but are not detected 2 = For further details, see Hambly et al. (1997ApJ...489L.157H) 3 = LSR0510+2713 - correct position is RA = 5:10:20.1, DE = +27:14:4) 4 = This M8.5 dwarf lies only 5.67 parsecs from the Sun (Reid et al., 2003AJ....125..354R) 5 = LSR1928-0200B - correct position is RA = 19:28:13.3, DE = -2:0:25) 6 = Further details are given in Lowrance et al. (2003ApJ...584L..95L).
History: From electronic version of the journal 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 Cruz et al., Paper V 2003AJ....126.2421C, Cat. J/AJ/126/2421 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 Vannier [CDS] 12-Jan-2004
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