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J/MNRAS/390/1517    Proper motions of field L and T dwarfs   (Casewell+, 2008)

Proper motions of field L and T dwarfs - II. Casewell S.L., Jameson R.F., Burleigh M.R. <Mon. Not. R. Astron. Soc., 390, 1517-1526 (2008)> =2008MNRAS.390.1517C
ADC_Keywords: Clusters, open ; Stars, dwarfs ; Proper motions Keywords: stars: kinematics - stars: low-mass, brown dwarfs - open clusters and associations: individual: Ursa Major - open clusters and associations: individual: Hyades - open clusters and associations: individual: Pleiades Abstract: By using images taken with Wide Field Camera (WFCAM) on United Kingdom Infrared Telescope (UKIRT) and Son of ISAAC (SofI) on the New Technology Telescope (NTT) and combining them with Two Micron All Sky Survey (2MASS) we have measured proper motions for 125 L and T dwarfs in the dwarf archive. Two of these L dwarfs appear to have M dwarf common proper motion companions, and two also appear to be high-velocity dwarfs, indicating possible membership of the thick disc. We have also compared the motion of these 125 objects to that of numerous moving groups, and have identified new members of the Hyades, Ursa Major and Pleiades moving groups. These new objects, as well as those identified in Jameson et al. have allowed us to refine the L dwarf sequence for Ursa Major that was defined by Jameson et al, 2008 (Cat. J/MNRAS/384/1399). Description: In order to measure proper motions for known L and T dwarfs we observed a sample of the known L and T dwarfs from the online dwarf archive (detailed in Tables 1 and 2, see http://spider.ipac.caltech.edu/staff/davy/ARCHIVE/ for discovery references) with J-band magnitudes of less than 16.5. 143 of these objects were presented in Jameson et al. (2008, Cat. J/MNRAS/384/1399). To complete the sample, 125 additional objects have been observed, 91 with declination (Dec.) between -30° and +60°, and 34 with Dec. of less than -30°. This first group were imaged using WFCAM on UKIRT over the period of 2006 June to 2008 March. The second group were imaged using SofI on the NTT between 2007 April 2 and 2007 August 31. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 112 36 2MASS name, positions, proper motions and 2MASS magnitudes for all the L and T dwarfs for which we measured proper motions using SofI table2.dat 112 89 2MASS name, positions, proper motions and 2MASS magnitudes for all the L and T dwarfs for which we measured proper motions using WFCAM
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/AJ/123/3409 : SDSS M, L, and T dwarfs (Hawley+, 2002) J/ApJ/564/421 : Spectra of T dwarfs. I. (Burgasser+, 2002) J/AJ/126/2487 : T dwarfs in the southern hemisphere (Burgasser+, 2003) J/AJ/127/3553 : JHK photometry and spectroscopy for L & T dwarfs (Knapp+ 2004) J/AJ/131/2722 : New L and T dwarfs from the SDSS (Chiu+, 2006) J/ApJ/648/629 : Radio observations of late M, L, and T dwarfs (Berger+, 2006) J/ApJ/651/502 : Spitzer IRAC photometry of M, L, and T dwarfs (Patten+, 2006) J/other/ARA+A/43.195 : L and T dwarf stars (Kirkpatrick, 2005) J/MNRAS/384/1399 : Proper motions of field L and T dwarfs. I (Jameson+, 2008) http://spider.ipac.caltech.edu/staff/davy/ARCHIVE/ : Archive of M,L,T dwarfs Byte-by-byte Description of file: table1.dat table2.dat
Bytes Format Units Label Explanations
1- 17 A17 --- 2MASS 2MASS name (JHHMMSSss+DDMMSSs) 19- 20 I2 h RAh Right ascension (J2000) 22- 23 I2 min RAm Right ascension (J2000) 25- 29 F5.2 s RAs Right ascension (J2000) 31 A1 --- DE- Declination sign (J2000) 32- 33 I2 deg DEd Declination (J2000) 35- 36 I2 arcmin DEm Declination (J2000) 38- 42 F5.2 arcsec DEs Declination (J2000) 44- 50 F7.2 mas/yr pmRA Proper motion along RA (pmRA*cosDE) 52- 57 F6.3 mas/yr e_pmRA rms uncertainty on pmRA 59- 66 F8.3 mas/yr pmDE Proper motion along DE 67- 73 F7.3 mas/yr e_pmDE rms uncertainty on pmDE 75- 80 F6.3 mag Jmag 2MASS J magnitude 82- 86 F5.3 mag e_Jmag rms uncertainty on Jmag 88- 93 F6.3 mag Hmag 2MASS H magnitude 95- 99 F5.3 mag e_Hmag ?=9.999 rms uncertainty on Hmag 101-106 F6.3 mag Ksmag 2MASS Ks magnitude 108-112 F5.3 mag e_Ksmag ?=9.999 rms uncertainty on Ksmag
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Mar-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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