J/ApJ/637/1067 Near-IR spectral classification of T dwarfs (Burgasser+, 2006)
A unified near-infrared spectral classification scheme for T dwarfs.
Burgasser A.J., Geballe T.R., Leggett S.K., Kirkpatrick J.D.,
Golimowski D.A.
<Astrophys. J., 637, 1067-1093 (2006)>
=2006ApJ...637.1067B 2006ApJ...637.1067B
ADC_Keywords: Stars, dwarfs ; Infrared sources ; Spectral types
Keywords: stars: fundamental parameters - stars: low-mass, brown dwarfs
Abstract:
A revised near-infrared classification scheme for T dwarfs is
presented, based on and superseding prior schemes developed by
Burgasser and coworkers (2002ApJ...564..421B 2002ApJ...564..421B) and Geballe and
coworkers (2002ApJ...564..466G 2002ApJ...564..466G), and defined following the precepts of
the MK process. Drawing from two large spectroscopic libraries of T
dwarfs identified largely in the Sloan Digital Sky Survey and the Two
Micron All Sky Survey, nine primary spectral standards and five
alternate standards spanning spectral types T0-T8 are identified that
match criteria of spectral character, brightness, absence of a
resolved companion, and accessibility from both the Northern and
Southern Hemispheres.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table13.dat 65 61 Comparison of T dwarf spectral types
table14.dat 173 69 T Dwarf compendium
refs.dat 112 51 References
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See also:
J/AJ/127/3553 : JHK photometry and spectroscopy for L and T dwarfs
(Knapp+, 2004)
J/ApJ/564/421 : Spectra of T dwarfs. I. (Burgasser+, 2002)
J/AJ/126/2487 : T dwarfs in the southern hemisphere (Burgasser+, 2003)
Byte-by-byte Description of file: table13.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- OName Truncated name
19- 44 A26 --- Name Object name
46- 49 A4 --- SpType New spectral type
50 A1 --- u_SpType [:p] Uncertainty flag on SpType (1)
52- 55 A4 --- SpType2 Spectral type from Burgasser et al.
(2000ApJ...531L..57B 2000ApJ...531L..57B)
56 A1 --- u_SpType2 [:p] Uncertainty flag on SpType2 (1)
58- 61 A4 --- SpType3 Spectral type from Geballe et al.
(2002ApJ...564..466G 2002ApJ...564..466G)
63- 65 F3.1 --- e_SpType3 ? Error in SpType3
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Note (1): Uncertainty flag defined as follows:
: = uncertain classification
p = peculiar source
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Byte-by-byte Description of file: table14.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- Name Object Name (1)
28 A1 --- r_pos Reference for the position
30- 31 I2 h RAh Hour of Right Ascension (J2000)
33- 34 I2 min RAm Minute of Right Ascension (J2000)
36- 40 F5.2 s RAs Second of Right Ascension (J2000)
42 A1 --- DE- Sign of the Declination (J2000)
43- 44 I2 deg DEd Degree of Declination (J2000)
46- 47 I2 arcmin DEm Arcminute of Declination (J2000)
49- 52 F4.1 arcsec DEs Arcsecond of Declination (J2000)
54- 60 F7.2 yr Epoch Epoch of position measurement
62 A1 --- u_SpType Uncertainty flag on SpType
63- 67 A5 --- SpType Spectral type from Burgasser et al. (2005)
70 A1 --- r_zmag Reference for zmag (2)
72- 76 F5.2 mag zmag ? The SDSS z (AB) magnitude
78- 81 F4.2 mag e_zmag ? Uncertainty in zmag
83 A1 --- r_Jmag Flag on Jmag
85- 89 F5.2 mag Jmag The 2MASS J magnitude
91- 94 F4.2 mag e_Jmag ? Uncertainty in Jmag
96 A1 --- r_Hmag Flag on Hmag
98-102 F5.2 mag Hmag ? The 2MASS H magnitude
104-107 F4.2 mag e_Hmag ? Uncertainty in Hmag
109 A1 --- r_Ksmag Flag on Ksmag
110 A1 --- l_Ksmag [>] Upper limit flag on Ksmag
111-115 F5.2 mag Ksmag ? The 2MASS Ks magnitude
117-120 F4.2 mag e_Ksmag ? Uncertainty in Ksmag
122 A1 --- r_plx Reference for plx
124-129 F6.4 arcsec plx ? Parallax
131-136 F6.4 arcsec e_plx ? Uncertainty in plx
138 A1 --- r_pm Reference for pm
140-145 F6.4 arcsec/yr pm ? Proper motion
147-152 F6.4 arcsec/yr e_pm ? Uncertainty in pm
154-156 I3 deg pmPA ? Proper motion angle E from N
158-173 A16 --- Refs Discovery and measurement references
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Note (1): Gliese 377CD is a misprint for Gliese 337CD.
Note (2): A "4" indicates z photometry from SDSS DR 4 (Cat. II/267), otherwise
z photometry is as reported from the literature (Leggett et al.
2000ApJ...536L..35L 2000ApJ...536L..35L; Geballe et al., 2002ApJ...564..466G 2002ApJ...564..466G ; Knapp et
al., 2004AJ....127.3553K 2004AJ....127.3553K).
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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- 4 A4 --- Ref Reference code
6- 24 A19 --- Bibcode Bibcode
26- 58 A33 --- Aut Author's name
59- 112 A54 --- Com Comment
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History:
* 14-Mar-2007: From electronic version of the journal
* 10-Sep-2007: Name 2MASS J1217110-0311131 corrected into
2MASS J12171110-0311131 (table 14)
* 13-Apr-2012: Name "GJ 377CD" correctzed into "GJ 337CD" (table14)
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 14-Mar-2007