SIMBAD references

2004ApJ...614L..73B - Astrophys. J., 614, L73-L76 (2004/October-2)

Discovery of a second L subdwarf in the two Micron All Sky Survey.


Abstract (from CDS):

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) 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 H2absorption. 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) and estimated tangential velocity (Vtan~90-210 km/s) 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.

Abstract Copyright:

Journal keyword(s): Galaxy: Solar Neighborhood - Stars: Chemically Peculiar - Stars: Individual: Alphanumeric: 2MASS J16262034+3925190 - Stars: Low-Mass, Brown Dwarfs - Stars: Subdwarfs

CDS comments: 2MASS 0532+8246 = 2MASS J05325346+8246465

Simbad objects: 5

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