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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 104 484 SDSS spectroscopic sample
table6.dat 154 545 Kinematics
refs.dat 66 41 References
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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
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Bytes Format Units Label Explanations
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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
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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- 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
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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.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 41 A18 --- Aut Author's name
44- 66 A23 --- Com Comments
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 24-May-2012