J/A+A/522/A112 i'z' photometry of L5 and later dwarf candidates (Reyle+, 2010)
The ultracool-field dwarf luminosity-function and space density from the
Canada-France Brown Dwarf Survey.
Reyle C., Delorme P., Willott C.J., Albert L., Delfosse X., Forveille T.,
Artigau E., Malo L., Hill G.J., Doyon R.
<Astron. Astrophys., 522, A112-112 (2010)>
=2010A&A...522A.112R 2010A&A...522A.112R
ADC_Keywords: Stars, dwarfs ; Photometry
Keywords: stars: low-mass - brown dwarfs -
stars: luminosity function, mass function - Galaxy: stellar content
Abstract:
Thanks to recent and ongoing large scale surveys, hundreds of brown
dwarfs have been discovered in the last decade. The Canada-France
Brown Dwarf Survey is a wide-field survey for cool brown dwarfs
conducted with the MegaCam camera on the Canada-France-Hawaii
Telescope.
Our objectives are to find ultracool brown dwarfs and to constrain the
field brown-dwarf luminosity function and the mass function from a
large and homogeneous sample of L and T dwarfs.
We identify candidates in CFHT/MegaCam i' and z' images and follow
them up with pointed near infrared (NIR) imaging on several
telescopes. Halfway through our survey we found ∼50 T dwarfs and ∼170
L or ultra cool M dwarfs drawn from a larger sample of 1400 candidates
with typical ultracool dwarfs i'-z' colours, found in 780 square
degrees.
Description:
The brown dwarf sample is drawn from the CFBDS, a survey fully
described in Delorme et al. (2008A&A...484..469D 2008A&A...484..469D). The CFBDS is a
survey in the i' and z' filters conducted with MegaCam at the CFHT.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 49 44 Synthetic colours computed on publicly
available spectra
table5.dat 92 103 Photometry of L5 and later dwarf candidates in
the MegaCam photometric system
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See also:
J/A+A/338/1066 : Optical Spectra of DENIS Brown Dwarf Candidate (Tinney+ 1998)
J/ApJ/564/421 : Spectra of T dwarfs. I. (Burgasser+, 2002)
J/A+A/400/891 : IZ photometry of Pleiades brown dwarfs (Moraux+, 2003)
J/AJ/127/2856 : Brown dwarfs in the 2MASS Survey (Burgasser+, 2004)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Star name
15- 19 A5 --- SpT MK spectral type
23- 27 F5.2 mag i'mag CFHT/MegaCam i' magnitude
29- 33 F5.2 mag z'mag CFHT/MegaCam z' magnitude
35- 39 F5.2 mag Jmag Johnson J magnitude
41- 44 F4.2 mag i'-z' CFHT/MegaCam i'-z' colour index
46- 49 F4.2 mag z'-J CFHT/MegaCam-Johnson z'-J colour index
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
13 A1 --- DE- Declination sign (J2000)
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 24 F5.2 arcsec DEs Declination (J2000)
26- 31 F6.3 mag z'mag CFHT/MegaCam z' magnitude
33- 37 F5.3 mag e_z'mag rms uncertainty on z'mag
39- 44 F6.3 mag i'mag ?=99.000 CFHT/MegaCam i' magnitude
46- 50 F5.3 mag e_i'mag rms uncertainty on i'mag
52 A1 --- l_i'-z' Limit flag on i'-z' (1)
53- 57 F5.3 mag i'-z' CFHT/MegaCam i'-z' colour index
59- 63 F5.3 mag e_i'-z' rms uncertainty on i'-z'
65- 70 F6.3 mag Jmag Johnson J magnitude
72- 76 F5.3 mag e_Jmag rms uncertainty on Jmag
78- 82 F5.3 mag z'-J CFHT/MegaCam-Johnson z'-J colour index
84- 90 A7 --- SpT MK spectral class
92 A1 --- r_SpT [abcd] References when spectral type (2)
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Note (1): For objects without detection in the i'-band, a lower limit is
given for the i'-z' colour.
Note (2): The spectral type is given for dwarfs with spectroscopic follow-up
as follows:
a = Warren et al. (2007MNRAS.381.1400W 2007MNRAS.381.1400W)
b = Delorme et al. (2008A&A...482..961D 2008A&A...482..961D)
c = Chiu et al. (2006, Cat. J/AJ/131/2722)
d = Knapp et al. (2004, Cat. J/AJ/127/3553)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Mar-2011