2MASS J06164006-6407194: THE FIRST OUTER HALO L SUBDWARF
- Institute for Astronomy, University of Hawai'i, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States)
- Massachusetts Institute of Technology, Kavli Institute for Astrophysics and Space Research, Building 37, Room 664B, 77 Massachusetts Avenue, Cambridge, MA 02139 (United States)
- Infrared Processing and Analysis Center, M/S 100-22, California Institute of Technology, Pasadena, CA 91225 (United States)
- Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY, 11794 (United States)
- Department of Astronomy, Caltech, MC 105-24, Pasadena, CA 91125 (United States)
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 H{sub 2}O, and enhanced collision induced absorption of H{sub 2}. 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 ({mu} = 1.''405 {+-} 0.008 yr{sup -1}), large radial velocity (V {sub rad} = 454 {+-} 15 km s{sup -1}), estimated u, v, w velocities (94, -573, 125) km s{sup -1} and Galactic orbit with an apogalacticon at {approx}29 kpc are indicative of membership in the outer halo making 2MASS J0616-6407 the first ultracool member of this population.
- OSTI ID:
- 21296181
- Journal Information:
- Astrophysical Journal, Vol. 696, Issue 1; Other Information: DOI: 10.1088/0004-637X/696/1/986; Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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