AAS 196th Meeting, June 2000
Session 3. Dwarf Stars
Display, Monday, June 5, 2000, 9:20am-6:30pm, Empire Hall South

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[3.07] A NIR Sequence of Late-M, L and T-dwarfs with CorMASS

J.C. Wilson, J.R. Houck (Cornell University), M.F. Skrutskie (University of Massachusetts), J.E. Gizis (IPAC), D.G. Monet (USNO Flagstaff Station), A.J. Burgasser (Caltech), J.D. Kirkpatrick (IPAC)

We present a sequence of low-resolution (R 300) near-infrared (NIR) spectra of late-M, L and T-dwarfs observed with the recently commissioned Cornell Massachusetts Slit Spectrograph (CorMASS) on the Palomar 60-inch telescope. NIR low resolution spectral features available for constructing a classification scheme are discussed along with a comparison with the red-optical classification scheme of Kirkpatrick et al. We also present zJHK spectra of 2MASSI J0559191-140448, CorMASS' first confirmed T-dwarf. Its brightness of Ks = 13.61, 0.4 magnitudes brighter than Gl 229B, will enable significant multi-wavelength study. Late L-dwarf spectral features observed in this object such as FeH and K I infer its temperature is close to the L/T transition. CorMASS was designed with the primary scientific purpose of spectrally confirming and classifying candidate low-mass stellar and sub-stellar objects identified by the Two Micron All Sky Survey (2MASS). CorMASS is a prism cross-dispersed spectrograph with wavelength coverage between 0.75 - 2.5 microns.

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