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J/AJ/139/1808   Colors and kinematics of SDSS  L dwarfs      (Schmidt+, 2010)

Colors and kinematics of L dwarfs from the Sloan Digital Sky Survey. Schmidt S.J., West A.A., Hawley S.L., Pineda J.S. <Astron. J., 139, 1808-1821 (2010)> =2010AJ....139.1808S
ADC_Keywords: Stars, dwarfs ; Stars, late-type ; Photometry, SDSS ; Photometry, infrared ; Radial velocities ; Space velocities ; Stars, distances Keywords: brown dwarfs - solar neighborhood - stars: kinematics and dynamics - stars: low-mass Abstract: We present a sample of 484 L dwarfs, 210 of which are newly discovered from the Sloan Digital Sky Survey (SDSS) Data Release 7 spectroscopic database. We combine this sample with known L dwarfs to investigate their izJHKS colors. We present photometric distance relations based on i-z and i-J colors and derive distances to our L dwarf sample. We combine the distances with SDSS/2MASS proper motions in order to examine the tangential velocities. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 104 484 SDSS spectroscopic sample table6.dat 154 545 Kinematics refs.dat 66 41 References
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) II/294 : SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+ 2009) J/AJ/123/3409 : SDSS M, L, and T dwarfs (Hawley+, 2002) J/AJ/126/2421 : 2MASS-Selected sample of ultracool dwarfs (Cruz+, 2003) J/AJ/127/3553 : L and T dwarfs JHK photometry & spectroscopy (Knapp+, 2004) J/AJ/131/2722 : New L and T dwarfs from the SDSS (Chiu+, 2006) J/ApJ/637/1067 : T dwarfs near-IR spectral classification (Burgasser+, 2006) J/AJ/133/439 : Luminosity function of M7-L8 ultracool dwarfs (Cruz+, 2007) J/AJ/134/1162 : 11 new T dwarfs in 2MASS (Looper+, 2007) J/AJ/135/785 : SDSS-DR5 low-mass star spectroscopic sample (West+, 2008) J/AJ/136/1290 : Ultracool dwarfs from the 2MASS (Reid+, 2008) J/MNRAS/384/1399 : Proper motions of field L and T dwarfs (Jameson+, 2008) J/AJ/137/1 : Late-type dwarfs pm & astrometry of (Faherty+, 2009) J/A+A/497/619 : New ultra-cool dwarfs from SDSS and 2MASS (Zhang+, 2009) J/ApJS/190/100 : NIR proper motion survey using 2MASS (Kirkpatrick+, 2010) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 18 A18 --- SDSS The SDSS Designation (HHMMSS.ss+DDMMSS.s) 20- 43 A24 --- OName Other name 45- 46 A2 --- SpT MK spectral type 48- 52 F5.2 --- imag ? SDSS i band magnitude 54- 57 F4.2 --- e_imag ? Uncertainty in imag 59- 63 F5.2 --- zmag ? SDSS z band magnitude 65- 68 F4.2 --- e_zmag ? Uncertainty in zmag 70- 74 F5.2 --- Jmag ? 2MASS J band magnitude 76- 79 F4.2 --- e_Jmag ? Uncertainty in Jmag 81- 85 F5.2 --- Hmag ? 2MASS H band magnitude 87- 90 F4.2 --- e_Hmag ? Uncertainty in Hmag 92- 96 F5.2 --- Ksmag ? 2MASS Ks band magnitude 98-101 F4.2 --- e_Ksmag ? Uncertainty in Ksmag 103-104 I2 --- Ref Discovery reference, in refs.dat file
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 18 A18 --- SDSS The SDSS Designation (HHMMSS.ss+DDMMSS.s) 20- 43 A24 --- OName Other name 45- 54 A10 --- SpT MK spectral type 56- 57 I2 --- r_SpT Reference for SpT, in refs.dat file 59- 65 F7.1 mas/yr pmRA ? Proper motion in Right Ascension direction 67- 70 F4.1 mas/yr e_pmRA ? Uncertainty in pmRA 72- 78 F7.1 mas/yr pmDE ? Proper motion in Declination direction 80- 84 F5.1 mas/yr e_pmDE ? Uncertainty in pmDE 86- 87 I2 --- r_pm ? Reference for proper motion, in refs.dat file 89- 93 F5.1 pc Dist ? Distance 95- 98 F4.1 pc e_Dist ? Uncertainty in Dist 100-106 F7.2 km/s RV ? Radial Velocity 108-112 F5.2 km/s e_RV ? Uncertainty in RV 114-120 F7.2 km/s U ? Galactic U velocity (1) 122-126 F5.2 km/s e_U ? Uncertainty in U 128-134 F7.2 km/s V ? Galactic V velocity (1) 136-140 F5.2 km/s e_V ? Uncertainty in V 142-148 F7.2 km/s W ? Galactic W velocity (1) 150-154 F5.2 km/s e_W ? Uncertainty in W
Note (1): Defined such that positive U values denote motion away from the Galactic Center, positive V values are in the direction of the solar motion, and positive W are parallel to the direction of the North Galactic Pole.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode BibCode 24- 41 A18 --- Aut Author's name 44- 66 A23 --- Com Comments
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 24-May-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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