Optical and near-infrared spectroscopy of the l subdwarf SDSS J125637.13-022452.4

  • Burgasser A
  • Witte S
  • Helling C
 et al. 
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Red optical and near-infrared spectroscopy are presented for SDSS J125637.13-022452.4, one of only four L subdwarfs reported to date. These data confirm the low-temperature, metal-poor nature of this source, as indicated by prominent metal-hydride bands, alkali lines, and collision-induced H2 absorption. The optical and near-infrared spectra of SDSS J1256-0224 are similar to those of the sdL4 2MASS J16262034+3925190, and we derive a classification of sdL3.5 based on the preliminary scheme of Burgasser, Cruz, & Kirkpatrick. The kinematics of SDSS J1256-0224 are consistent with membership in the Galactic inner halo, with estimated $UVW$ space velocities indicating a slightly prograde, eccentric and inclined Galactic orbit (3.5

Author-supplied keywords

  • Brown dwarfs
  • Stars: chemically peculiar
  • Stars: individual (SDSS J125637.13-022452.4)
  • Stars: low-mass
  • Subdwarfs

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  • Adam J. Burgasser

  • Soeren Witte

  • Christiane Helling

  • Robyn E. Sanderson

  • John J. Bochanski

  • Peter H. Hauschildt

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