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Title:
Discovery of a Second L Subdwarf in the Two Micron All Sky Survey
Authors:
Burgasser, Adam J.
Affiliation:
AA(Department of Astrophysics, Division of Physical Sciences, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024; )
Publication:
The Astrophysical Journal, Volume 614, Issue 1, pp. L73-L76. (ApJL Homepage)
Publication Date:
10/2004
Origin:
UCP
ApJ Keywords:
Galaxy: Solar Neighborhood, Stars: Chemically Peculiar, Stars: Individual: Alphanumeric: 2MASS J16262034+3925190, Stars: Low-Mass, Brown Dwarfs, Stars: Subdwarfs
DOI:
10.1086/425418
Bibliographic Code:
2004ApJ...614L..73B

Abstract

I report the discovery of the second L subdwarf identified in the Two Micron All Sky Survey, 2MASS J16262034+3925190. This high proper motion object (μ=1.27"+/-0.03" yr-1) exhibits near-infrared spectral features indicative of a subsolar metallicity L dwarf, including strong metal hydride and H2O absorption bands, pressure-broadened alkali lines, and blue near-infrared colors caused by enhanced collision-induced H2 absorption. This object is of later type than any of the known M subdwarfs but does not appear to be as cool as the apparently late-type sdL 2MASS 0532+8246. The radial velocity (Vrad=-260+/-35 km s-1) and estimated tangential velocity (Vtan~90-210 km s-1) of 2MASS 1626+3925 indicate membership in the Galactic halo, and this source is likely near or below the hydrogen-burning minimum mass for a metal-poor star. L subdwarfs such as 2MASS 1626+3925 are useful probes of gas and condensate chemistry in low-temperature stellar and brown dwarf atmospheres, but more examples are needed to study these objects as a population as well as to define a rigorous classification scheme.
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