J/MNRAS/427/3280 Ultra-cool dwarfs at low Galactic latitudes (Folkes+, 2012)
Identifying ultra-cool dwarfs at low Galactic latitudes:
a southern candidate catalogue.
Folkes S.L., Pinfield D.J., Jones H.R.A., Kurtev R., Zhang Z.,
Galvez-Ortiz M.C., Marocco F., Day-Jones A.C., Clarke J.R.A.
<Mon. Not. R. Astron. Soc., 427, 3280-3319 (2012)>
=2012MNRAS.427.3280F 2012MNRAS.427.3280F
ADC_Keywords: Infrared sources ; Stars, late-type ; Photometry, infrared
Keywords: techniques: photometric - techniques: spectroscopic - surveys -
brown dwarfs - stars: kinematics and dynamics - stars: low-mass
Abstract:
We present an ultra-cool dwarf (UCD) catalogue compiled from low
southern Galactic latitudes and mid-plane, from a cross-correlation of
the Two Micron All-Sky Survey (2MASS) and the SuperCOSMOS survey. The
catalogue contains 246 members identified from 5042deg2 within
220°≤l≤360° and 0°<l≤30°, for |b|≤15°. Sixteen
candidates are spectroscopically confirmed in the near-infrared as
UCDs with spectral types from M7.5V to L9, the latest being the
unusual blue L dwarf 2MASSJ11263991-5003550. Our catalogue selection
method is presented enabling UCDs from ∼M8V to the L-T transition to
be selected down to a 2MASS limiting magnitude of Ks≃14.5mag (for
S/N≥10).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 135 246 Southern Galactic Plane UCD (SGPUCD) catalogue
containing 246 members
table6.dat 59 246 Photometric spectral types and distance estimates
refs.dat 64 14 References
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See also:
B/denis : The DENIS database (DENIS Consortium, 2005)
I/284 : The USNO-B1.0 Catalog (Monet+ 2003)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/AJ/126/1526 : IR photometry of ultracool dwarfs (Bouy+, 2003)
J/AJ/126/2449 : Nearby ultracool dwarfs in galactic plane (Reid+, 2003)
J/AJ/126/2421 : 2MASS-Selected sample of ultracool dwarfs (Cruz+, 2003)
J/A+A/416/655 : Ultracool dwarfs IR spectra atomic lines (Lyubchik+, 2004)
J/A+A/446/515 : Distances of nearby ultracool dwarfs (Phan-Bao+, 2006)
J/MNRAS/382/515 : SDSS ultracool and halo WD candidates (Vidrih+, 2007)
J/AJ/133/439 : Luminosity function of M7-L8 ultracool dwarfs (Cruz+, 2007)
J/AJ/133/2258 : Activity and kinematics of ultracool dwarfs (Schmidt+, 2007)
J/AJ/136/1290 : Ultracool dwarfs from the 2MASS (Reid+, 2008)
J/A+A/497/619 : New ultra-cool dwarfs from SDSS and 2MASS (Zhang+, 2009)
J/ApJ/723/684 : NIRSPEC ultracool dwarf RV survey (Blake+, 2010)
J/MNRAS/404/1817 : 2MASS/SDSS data for 806 ultracool dwarfs (Zhang+, 2010)
J/ApJ/746/23 : UCDs radio activity-rotation relations (McLean+, 2012)
J/A+A/549/A131 : Radio survey of ultracool dwarfs (Antonova+, 2013)
J/A+A/556/A133 : Low-mass companion to ultracool dwarf orbit (Sahlmann+ 2013)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Entry number of the SGPUCD catalogue members
5- 20 A16 --- 2MASS 2MASS designation as obtained from the PSC
(HHMMSSss+DDMMSSs, Cat. II/246)
22- 27 F6.3 mag Jmag 2MASS J magnitude
29- 33 F5.3 mag J-H 2MASS J-H colour index
35- 39 F5.3 mag J-Ks 2MASS J-Ks colour index
41- 45 F5.3 mag Ic-Ks ?=- SSA/2MASS Ic-Ks colour index (1)
47- 51 F5.3 mag Rc-Ic ?=- SSA/2MASS Rc-Ic colour index (1)
53- 57 F5.2 mag H(K) ?=- Reduced proper motion (2)
59- 61 A3 --- PM [Yes/No ] Visual pm (3)
63- 68 F6.4 arcsec/yr pm ?=- Total proper motion (2)
69 A1 --- n_pm [+] Proper motion from Phan-Bao (4)
70- 76 F7.3 arcsec/yr pmRA ?=- Proper motion along RA, pmRA*cosDE (2)
77 A1 --- n_pmRA [+] Proper motion from Phan-Bao (4)
79- 86 F8.3 arcsec/yr pmDE ?=- Proper motion along DE (2)
87 A1 --- n_pmDE [+] Proper motion from Phan-Bao (4)
89- 99 A11 --- SpType MK spectral type
101-103 F3.1 --- e_SpType ? rms uncertainty on SpType
105-107 A3 --- Type [PS/K ] Catalog membership type (5)
109-114 F6.2 pc Dist ?=- Distance
117-121 F5.2 pc E_Dist ?=- Error on distance (upper value)
123-127 F5.2 pc e_Dist ?=- Error on distance (lower value)
129-133 A5 --- Refs References, in refs.dat files
135 A1 --- n_Refs [p] data from the references (6)
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Note (1): SSA (SuperCOSMOS Science Archive) optical colours: RF- and
IN-band photometry is transformed on to the standard Cousins system
where both are available (Bessell, 1986PASP...98.1303B 1986PASP...98.1303B), otherwise SSA
RF and IN magnitudes are used.
Note (2): The reduced proper motion (H(K)) calculated using the 2MASS Ks
magnitude, and the proper-motion data from the SSA in units of
arcsec/yr: H(K)=Ks+5+5logµ. Astrometric, photometric and
proper-motion data are presented, as well as spectral types and
distances derived for both the spectroscopic and photometric samples.
Note (3): Possible proper motions determined by visual examination of the
2MASS images, SSS RF- and IN-band optical images, and/or DENIS I- or
J-band images.
Note (4): + = The proper-motion data are taken from Phan-Bao et al.
(2008, Cat. J/MNRAS/383/831)
Note (5): The mode by which catalogue membership was based, and how the
subsequent spectral types and distances were calculated, as:
P = photometric analysis
S = spectroscopic analysis
K = known object (was previously discovered)
Note (6): p = the proper-motion data, spectral types and distances have
been taken from the references where available
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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- 16 A16 --- 2MASS 2MASS designation as obtained from the PSC
(HHMMSSss+DDMMSSs)
17 A1 --- n_Ic-J [+] DENIS I-band magnitude used (7)
19- 23 F5.3 mag Ic-J ? Ic-J colour index (8)
25- 29 A5 --- SpT2 Photometric spectral type (9)
31- 33 F3.1 --- e_SpT2 ? Error on SpType2
34 A1 --- n_SpT2 [S] S for part of our spectroscopic sample,
no SpT2 (or Dist2) quoted
36- 41 F6.2 pc Dist2 ? Photometric distance (10)
43- 47 F5.2 pc e_Dist2 ? rms uncertainty on Dist
49 A1 --- n_Dist2 [S] S for part of our spectroscopic sample,
no Distance quoted
51- 59 A9 --- Name Abbreviated 2MASS name from PSC, HHMM+DDMM
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Note (7): + indicates that the photometric spectral types and distances have
been calculated from Ic-J colours using DENIS I-band magnitudes (Gunn-i).
Note (8): I-band magnitudes are from the SuperCOSMOS Science Archive (SSA:
IN transformed to Ic), or from DENIS (Gunn-i), which are indicated
with a '+' in n_Ic-J
Note (9): Photometric spectral types obtained from the MJ/Ic-J, and MJ/SpT
relations of Dahn et al. (2002AJ....124.1170D 2002AJ....124.1170D) valid for UCD spectral
types of M7V to ∼L9. The spectral types and uncertainties have been
rounded to the nearest 0.5 of a sub-type. An uncertainty of I=0.3mag
was assumed for all the distance and spectral type propagated errors
for candidates with IN magnitudes, else for DENIS I-band data the
individual object uncertainties were used. Note that candidates with
Ic-J values that fall outside the valid colour range of the SpT/Ic-J
relation are denoted with spectral types of '<M7V' or '>L9' accordingly.
Note (10): Photometric distance estimates are obtained from the distance
modulus where the apparent J-band magnitude mj is from 2MASS, and MJ
is from the MJ/Ic-J relation (Dahn et al., 2002AJ....124.1170D 2002AJ....124.1170D).
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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 code
4- 22 A19 --- BibCode BibCode
24- 41 A18 --- Aut author's name
45- 64 A20 --- Com Comments
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 06-Sep-2013