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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file tableb1.dat 97 213 Objects cross-matched between UKIDSS LAS and 2MASS tableb2.dat 97 54 Objects cross-matched between UKIDSS GCS and 2MASS notes.dat 80 27 Notes
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) Byte-by-byte Description of file: tableb?.dat
Bytes Format Units Label Explanations
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
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).
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1 A1 --- Note Note code 3- 21 A19 --- BibCode BibCode 23- 48 A26 --- Aut Author's name 51- 80 A30 --- Com Comments
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Oct-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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