SIMBAD references

2009ApJ...696..986C - Astrophys. J., 696, 986-993 (2009/May-1)

2MASS J06164006-6407194: the first outer halo l subdwarf.

CUSHING M.C., LOOPER D., BURGASSER A.J., KIRKPATRICK J.D., FAHERTY J., CRUZ K.L., SWEET A. and SANDERSON R.E.

Abstract (from CDS):

We present the serendipitous discovery of an L subdwarf in the Two Micron All Sky Survey (2MASS) J06164006-6407194, in a search of the 2MASS for T dwarfs. Its spectrum exhibits features indicative of both a cool and metal poor atmosphere including a heavily pressure-broadened K I resonant doublet, Cs I and Rb I lines, molecular bands of CaH, TiO, CrH, FeH, and H2O, and enhanced collision induced absorption of H2. We assign 2MASS J0616-6407 a spectral type of sdL5 based on a comparison of its red optical spectrum to that of near solar-metallicity L dwarfs. Its high proper motion (µ = 1".405±0.008/yr), large radial velocity (Vrad= 454±15 km/s), estimated u, v, w velocities (94, -573, 125) km/s and Galactic orbit with an apogalacticon at ∼29 kpc are indicative of membership in the outer halo making 2MASS J0616-6407 the first ultracool member of this population.

Abstract Copyright:

Journal keyword(s): infrared: stars - stars: individual: 2MASS J0164006-6407194 - stars: low-mass, brown dwarfs - subdwarfs

Simbad objects: 18

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2021.09.23-10:36:58

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