J/MNRAS/394/857 UKIDSS-2MASS proper motion survey (Deacon+, 2009)
The UKIDSS-2MASS proper motion survey - I. Ultracool dwarfs from UKIDSS DR4.
Deacon N.R., Hambly N.C., King R.R., McCaughrean M.J.
<Mon. Not. R. Astron. Soc., 394, 857-871 (2009)>
=2009MNRAS.394..857D 2009MNRAS.394..857D
ADC_Keywords: Surveys ; Infrared sources ; Stars, dwarfs ; Proper motions
Keywords: astronomical data bases: miscellaneous - surveys - astrometry -
stars: low-mass, brown dwarfs -
stars: luminosity function, mass function - infrared: stars
Abstract:
The UK Infrared Telescope Infrared Deep Sky Survey (UKIDSS) is the
first of a new generation of infrared surveys. Here, we combine the
data from two UKIDSS components, the Large Area Survey (LAS) and the
Galactic Cluster Survey (GCS), with Two-Micron All-Sky Survey (2MASS)
data to produce an infrared proper motion survey for low-mass stars
and brown dwarfs. In total, we detect 267 low-mass stars and brown
dwarfs with significant proper motions. We recover all 10 known single
L dwarfs and the one known T dwarf above the 2MASS detection limit in
our LAS survey area and identify eight additional new candidate L
dwarfs. We also find one new candidate L dwarf in our GCS sample. Our
sample also contains objects from 11 potential common proper motion
binaries. Finally, we test our proper motions and find that while the
LAS objects have proper motions consistent with absolute proper
motions, the GCS stars may have proper motions which are significantly
underestimated. This is possibly due to the bulk motion of some of the
local astrometric reference stars used in the proper motion
determination.
Description:
Photometry and astrometry for 267 ultracool dwarfs found by cross
matching the UKIDSS DR4 Galactic Cluster and Large Area Surveys with
the 2MASS survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 96 213 Objects cross-matched between UKIDSS LAS and 2MASS
tableb2.dat 97 54 Objects cross-matched between UKIDSS GCS and 2MASS
notes.dat 70 27 Notes
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: tableb?.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Star Name
(ULAS2MASSHHMM+DDMM or UGCS2MASSHHMM+DDMM)
20- 21 I2 h RAh Right ascension (J2000)
23- 24 I2 min RAm Right ascension (J2000)
26- 30 F5.2 s RAs Right ascension (J2000)
32 A1 --- DE- Declination sign (J2000)
33- 34 I2 deg DEd Declination (J2000)
36- 37 I2 arcmin DEm Declination (J2000)
39- 42 F4.1 arcsec DEs Declination (J2000)
44- 48 F5.3 arcsec/yr pm Proper motion
50- 54 F5.1 deg pmPA Position angle
56- 60 F5.3 arcsec/yr e_pm rms uncertainty on pm
61 A1 --- n_pm [ab] Note on pm computation (1)
63- 66 F4.1 deg e_pmPA rms uncertainty on PA
68- 73 F6.3 mag Ymag UKIDSS UKIDSS-Y magnitude (2)
75- 80 F6.3 mag Jmag UKIDSS UKIDSS-J magnitude (2)
82- 87 F6.3 mag Hmag UKIDSS UKIDSS-H magnitude (2)
89- 94 F6.3 mag Kmag UKIDSS UKIDSS-K magnitude (2)
96 A1 --- Note Note, in notes.dat file
97 A1 --- Mm [*] *: object has been identified as a
potential cluster member
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Note (1): Note as follows:
a = Objects whose astrometric solutions were calculated using
local reference stars
b = Objects whose astrometric solutions were calculated using only
global error estimates
Note (2): All photometry is in the UKIDSS system
(Hewett et al., 2006MNRAS.367..454H 2006MNRAS.367..454H).
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1 A1 --- Note Note code
3- 21 A19 --- BibCode BibCode
23- 48 A26 --- Aut Author's name
51- 80 A30 --- Com Comments
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Oct-2009