J/ApJ/787/126 WISE reduced proper motions and spectral types (Luhman+, 2014)
Characterization of high proper motion objects from the wide-field infrared
survey explorer.
Luhman K.L., Sheppard S.S.
<Astrophys. J., 787, 126 (2014)>
=2014ApJ...787..126L 2014ApJ...787..126L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, dwarfs ; Photometry, infrared ; Proper motions ;
Spectral types
Keywords: brown dwarfs - infrared: stars - proper motions - solar neighborhood -
stars: low-mass
Abstract:
We present an analysis of high proper motion objects that we have
found in a recent study and in this work with multi-epoch astrometry
from the Wide-field Infrared Survey Explorer (WISE). Using photometry
and proper motions from the Two Micron All-Sky Survey and WISE, we
have identified the members of this sample that are likely to be
late-type, nearby, or metal-poor. We have performed optical and
near-infrared spectroscopy on 41 objects, from which we measure
spectral types that range from M4-T2.5. This sample includes 11 blue
L dwarfs and 5 subdwarfs; the latter were also classified as such in
the recent study by Kirkpatrick and coworkers. Based on their spectral
types and photometry, several of our spectroscopic targets may have
distances of <20 pc with the closest at ∼12 pc. The tangential
velocities implied by the spectrophotometric distances and proper
motions indicate that four of the five subdwarfs are probably members
of the Galactic halo while several other objects, including the
early-T dwarf WISE J210529.08-623558.7, may belong to the thick disk.
Description:
Luhman (2014, J/ApJ/781/4) used multi-epoch astrometry from WISE to
identify 762 high proper motion objects. For this study, we consider
the 761 sources that were detected by 2MASS because our analysis
relies on both 2MASS and WISE photometry. The one remaining object
that is absent from 2MASS, WISE J085510.83-071442.5, has been
characterized by Luhman (2014ApJ...786L..18L 2014ApJ...786L..18L). We also examine an
additional 20 high proper motion objects that are presented in Table 1,
one of which (WISE J175510.28+180320.2) has already been reported
by Griffith et al. (2012, J/AJ/144/148) and Mace et al.
(2013ApJS..206....6D 2013ApJS..206....6D).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 30 781 Reduced Proper Motions and Spectral Type
Estimates
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
J/AJ/123/3409 : SDSS M, L, and T dwarfs (Hawley+, 2002)
J/AJ/127/3553 : JHK photometry and spectroscopy for L and T dwarfs
(Knapp+, 2004)
J/AJ/144/148 : Infrared photometry of brown dwarf and Hyper-LIRG
(Griffith+, 2012)
J/ApJ/781/4 : Photometry of high proper motion objects from WISE
(Luhman, 2014)
J/ApJ/783/122 : AllWISE motion survey (Kirkpatrick+, 2014)
J/MNRAS/454/4054 : High proper motion sources from WISE (Beamin+, 2015)
J/ApJ/817/112 : NEOWISE/AllWISE high proper motion objects
(Schneider+, 2016)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- WISE Source name (WISE JHHMMSS.ss+DDMMSS.s) from
the WISE All-Sky Source Catalog (Cat. II/311)
21- 25 F5.2 mag Hw2 Reduced proper motion in W2 band
27- 30 F4.1 --- SpType Spectral type estimated from colors (1)
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Note (1): Numerical types are defined such that -8, 0, 10, and 20 correspond
to K0, M0, L0, and T0, respectively.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 30-Jun-2017