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HD 34360


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The First Substellar Subdwarf? Discovery of a Metal-poor L Dwarf with Halo Kinematics
We present the discovery of the first L-type subdwarf, 2MASSJ05325346+8246465. This object exhibits enhanced collision-inducedH2 absorption, resulting in blue near-infrared (NIR) colors(J-Ks=0.26+/-0.16). In addition, strong hydride bands in thered optical and NIR, weak TiO absorption, and an optical/J-band spectralmorphology similar to the L7 DENIS 0205-1159AB imply a cool,metal-deficient atmosphere. We find that 2MASS 0532+8246 has both a highproper motion, ?=2.60"+/-0.15"yr-1, and a substantialradial velocity, vrad=-195+/-11 km s-1, and itsprobable proximity to the Sun (d=10-30 pc) is consistent with halomembership. Comparison to subsolar-metallicity evolutionary modelsstrongly suggests that 2MASS 0532+8246 is substellar, with a mass of0.077<~M<~0.085Msolar for ages 10-15 Gyr andmetallicities Z=0.1-0.01Zsolar. The discovery of this objectclearly indicates that star formation occurred below the hydrogenburning mass limit at early times, consistent with prior resultsindicating a flat or slightly rising mass function for the lowest massstellar subdwarfs. Furthermore, 2MASS 0532+8246 serves as a prototypefor a new spectral class of subdwarfs, additional examples of whichcould be found in NIR proper-motion surveys.

A. de Sitter's photographic polar photometry revisited; some remarks on photographic photometry with objective gratings
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Photographic magnitudes of stars brighter than 7m.75 between +75° and +80° declination (Errata: 11 270)
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Yerkes actinometry. Zone +73deg to +90deg.
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Observation and Astrometry data

Constellation:Girafe
Right ascension:05h37m15.07s
Declination:+83°51'41.2"
Apparent magnitude:7.136
Distance:204.918 parsecs
Proper motion RA:5
Proper motion Dec:-20.7
B-T magnitude:7.131
V-T magnitude:7.136

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 34360
TYCHO-2 2000TYC 4617-1504-1
USNO-A2.0USNO-A2 1725-00237349
HIPHIP 26407

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