Michael C. Cushing et al. 2009 ApJ 696 986 doi:10.1088/0004-637X/696/1/986
2MASS J06164006–6407194: THE FIRST OUTER HALO L SUBDWARF
FREE ISSUEMichael C. Cushing1, Dagny Looper1, Adam J. Burgasser2, J. Davy Kirkpatrick3, Jacqueline Faherty4, Kelle L. Cruz5, Anne Sweet5 and Robyn E. Sanderson2
Show affiliationsWe 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–1), large radial velocity (V rad = 454 ± 15 km s–1), estimated u, v, w velocities (94, –573, 125) km s–1 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.
- Keywords
infrared: stars; stars: individual (2MASS J0164006-6407194); stars: low-mass, brown dwarfs; subdwarfs
- Dates
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Issue 1 (2009 May 1)
Received 2009 January 5, accepted for publication 2009 February 5
Published 2009 April 20
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2MASS J06164006–6407194: The First Outer Halo L Subdwarf
Michael C. Cushing et al. 2009 ApJ 696 986
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