J/AJ/127/3553 JHK photometry and spectroscopy for L and T dwarfs (Knapp+, 2004)
Near-infrared photometry and spectroscopy of L and T dwarfs: the effects of
temperature, clouds, and gravity.
Knapp G.R., Leggett S.K., Fan X., Marley M.S., Geballe T.R.,
Golimowski D.A., Finkbeiner D., Gunn J.E., Hennawi J., Ivezic Z.,
Lupton R.H., Schlegel D.J., Strauss M.A., Tsvetanov Z.I., Chiu K.,
Hoversten E.A., Glazebrook K., Zheng W., Hendrickson M., Williams C.C.,
Uomoto A., Vrba F.J., Henden A.A., Luginbuhl C.B., Guetter H.H., Munn J.A.,
Canzian B., Schneider D.P., Brinkmann J.
<Astron. J., 127, 3553-3578 (2004)>
=2004AJ....127.3553K 2004AJ....127.3553K
ADC_Keywords: Stars, dwarfs ; Stars, late-type; Photometry, infrared ;
Spectroscopy
Keywords: infrared: stars - stars: fundamental parameters - stars: late-type
stars: low-mass, brown dwarfs
Abstract:
We present new JHK photometry on the MKO-NIR (Mauna Kea Observatories
Near-Infrared) system and JHK spectroscopy for a large sample of L and
T dwarfs. Photometry has been obtained for 71 dwarfs, and spectroscopy
for 56. The sample comprises newly identified very red objects from
the Sloan Digital Sky Survey (SDSS, http://www.sdss.org/) and known
dwarfs from the SDSS and the Two Micron All Sky Survey (2MASS, Cat.
II/246). Spectral classification has been carried out using four
previously defined indices from Geballe et al. (2002ApJ...564..466G 2002ApJ...564..466G)
that measure the strengths of the near infrared water and methane
bands.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 50 51 New confirmed late-M, L, and T dwarfs from SDSS
table3.dat 94 76 New MKO-NIR JHK photometry
table9.dat 96 111 Magnitudes and colors, sorted by infrared
spectral type
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 25 A25 --- Name Object designation
27 A1 --- f_Name [ab] Flag on Name (1)
29- 33 F5.2 mag imag SDSS i band magnitude (2)
35- 38 F4.2 mag e_imag Error in imag
40- 44 F5.2 mag zmag SDSS z band magnitude (2)
46- 49 F4.2 mag e_zmag Error in zmag
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Note (1): Flag on Name, defined as follows:
a = Optical spectroscopy given by Hawley et al. (2002, Cat. J/AJ/123/3409)
b = Discovered in the 2MASS database by Cruz et al. (2003,
Cat. J/AJ/126/2421).
Note (2): The SDSS asinh magnitudes (Lupton et al. 1999AJ....118.1406L 1999AJ....118.1406L)
corresponding to zero flux are i=24.4 and z=22.8.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 25 A25 --- Name Object designation
27- 44 A18 --- TName Truncated designation
46- 50 F5.2 mag Jmag MKO J band magnitude
52- 55 F4.2 mag e_Jmag Error in Jmag
57- 61 F5.2 mag Hmag MKO H band magnitude
63- 66 F4.2 mag e_Hmag Error in Hmag
68- 72 F5.2 mag Kmag MKO K band magnitude
74- 77 F4.2 mag e_Kmag Error in Kmag
79- 88 A10 "YYYY/MM/DD" ObsDate Date of observation
90- 94 A5 --- Camera Camera used in observation
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 25 A25 --- Name Object designation
27- 29 A3 --- f_Name Flag on Name (1)
31- 42 A12 --- SpType Spectral type (2)
44 A1 --- f_SpType [cdko] Flag on SpType (3)
46- 50 F5.2 mag JMAG ? Absolute MKO J band magnitude
52- 55 F4.2 mag i-z ? SDSS (i-z) color index
57- 61 F5.2 mag zmag ? SDSS z band magnitude
63- 66 F4.2 mag z-J ? The (z-J) color index
68- 71 F4.2 mag Z-J ? The (Z-J) color index (4)
73- 77 F5.2 mag Jmag Apparent MKO J band magnitude
79- 83 F5.2 mag J-K MKO (J-K) color index
85- 89 F5.2 mag J-H MKO (J-H) color index
91- 95 F5.2 mag H-K MKO (H-K) color index
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Note (1): Flag on Name, defined as follows:
b = JHK magnitudes synthesized from flux calibrated spectrum.
e = 2MASS J0028+1501 may be variable at the 5% level; measured J/H/K of:
16.5(0.03)/15.42(0.03)/14.63(0.05) on 2000/11/19,
16.65(0.05)/15.56(0.05)/14.57(0.05) on 2001/01/14,
16.45(0.03)/15.54(0.03)/14.51(0.03) on 2001/11/24, and
16.44(0.03)/15.44(0.03)/14.53(0.03) on 2002/01/08.
f = DENIS-P J1058.7-1548 = 2MASS J10584787-1548172.
g = GD 165B = 2MASS J14243909+0917104.
h = Kelu-1 = 2MASS J13054019-2541059.
i = LHS 102B = 2MASS J00043484-4044058.
j = SDSS J2249+0044 may be variable at the 10% level; measured J/H/K of:
16.58(0.03)/15.39(0.03)/14.46(0.03) on 2000/11/19,
16.46(0.05)/15.42(0.05)/14.43(0.05) on 2001/01/16, and
16.36(0.03)/15.30(0.03)/14.38(0.03) on 2002/01/08.
l = DENIS-P J0205.4-1159AB = 2MASS J02052940-1159296AB.
m = DENIS-P J1228.2-1547AB = 2MASS J12281523-1547342AB.
n = 2MASS J15232263+3014562 = Gl 584C.
p = ZJHK magnitudes synthesized from flux calibrated spectrum.
q = Gl 570D = 2MASS J14571496-2121477.
Note (2): Spectral types in square brackets estimated from colors.
Note (3): Flag on SpType, defined as follows:
c = Spectral type from Kirkpatrick et al. (2000AJ....120..447K 2000AJ....120..447K).
d = Optical spectral type later than infrared type by >1 subclass.
k = Optical spectral type earlier than infrared type by >1 subclass.
o = Spectral type from Burgasser et al. (2002, Cat. J/ApJ/564/421) or
typed by us from Burgasser et al. data.
Note (4): Where Z is on the UKIRT (United Kingdom Infra-Red Telescope)
UFTI (UKIRT Fast-Track Imager) system.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 11-May-2005