Infrared Classification of L and T Dwarfs

Details Infrared Classification of L and T Dwarfs Infrared Classification of L and T Dwarfs

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..670g&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August

Astronomy and Astrophysics

Astrophysics

1

Classification, L Dwarfs, T Dwarfs, Brown Dwarfs

Scientific paper

We use new and published medium resolution 0.6--2.5 μm spectra of L and T dwarfs to develop a unified classification system for both of these new spectral classes. Two indices of the system at 1.2 μm and 1.5 μm are based on nearby absorption bands of water vapor and two are associated with methane bands near 1.6 μm and 2.2 μm. The 1.5 μm index is monotonic through the L and T sequences, and forms the backbone of the system; the indices for the other bands provide extensive, but only partial, coverage. We correlate the 1.5 μm index with continuum indices shortward of 1 μm devised by others for classifying L dwarfs, in order to obtain a tight link between optical and infrared classifications. Our proposed system defines ten spectral subclasses for L (L0--L9) and nine for T (T0--T8). The boundary between L and T is defined to be the onset of absorption by methane in the H band. Methane absorption in the K band near 2.2 μm is found to begin approximately at L8.

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