J/MNRAS/384/1399 Proper motions of field L and T dwarfs (Jameson+, 2008)
Proper motions of field L and T dwarfs.
Jameson R.F., Casewell S.L., Bannister N.P., Lodieu N., Keresztes K.,
Dobbie P.D., Hodgkin S.T.
<Mon. Not. R. Astron. Soc., 384, 1399-1413 (2008)>
=2008MNRAS.384.1399J 2008MNRAS.384.1399J
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:
The proper motion measurements for 142 previously known L and T dwarfs
are presented. From this sample we identify and discuss eight
high-velocity L dwarfs. We also find four new wide common proper
motion binaries/multiple systems. Using the moving cluster methods we
have also identified a number of L dwarfs that may be members of the
Ursa Major (age∼400Myr), the Hyades (age∼625Myr) and the Pleiades
(age∼125Myr) moving groups.
Description:
In order to measure proper motions for known L and T dwarfs we
observed 142 L and T dwarfs from the DwarfArchive (detailed in
Table 1, see http://spider.ipac.caltech.edu/staff/davy/ARCHIVE/ for
discovery references) with declinations between -30° and 60° and
J-band magnitudes of less than 16.5. The images were taken using WFCAM
on UKIRT over the period of 2006 February to 2006 August.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 72 142 2MASS name, positions and proper motions for all
of the L and T dwarfs for which we measured
proper motions
--------------------------------------------------------------------------------
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/390/1517 : Proper motions of field L and T dwarfs. II (Casewell+, 2008)
http://spider.ipac.caltech.edu/staff/davy/ARCHIVE/ : Archive of M,L,T dwarfs.
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- 2MASS 2MASS designation
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- 51 F8.2 mas/yr pmRA Proper motion along RA (pmRA*cosDE)
53- 57 F5.2 mas/yr e_pmRA rms uncertainty on pmRA
59- 66 F8.2 mas/yr pmDE Proper motion along DE
68- 72 F5.2 mas/yr e_pmDE rms uncertainty on pmDE
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Mar-2009