Infrared Colors of L and T Dwarfs

Details Infrared Colors of L and T Dwarfs Infrared Colors of L and T Dwarfs

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..120l&link_type=abstract

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

Astronomy and Astrophysics

Astrophysics

3

Late Type Stars, Low-Mass Stars, Brown Dwarfs, Infrared Observations

Scientific paper

We discuss the behaviour of the JHKL'M' colors of L and T dwarfs, based on new photometric and spectroscopic data obtained at the United Kingdom Infrared Telescope in Hawaii. We have measured the first accurate M' photometry for L and T dwarfs. The K--M' colors of T dwarfs are much bluer than predicted by published models, suggesting that CO may be more abundant than expected, as has been found spectroscopically for the T6 dwarf Gl 229B. We also find that K--L' increases monotonically through most of the M, L, and T subclasses, but it is approximately constant between types L6 and T5, due to the onset of CH4 absorption at the blue edge of the L' bandpass. The JHK colors of L dwarfs show significant scatter, suggesting variations in the amount and properties of photospheric dust, and indicating that it may not be possible to associate a unique Teff with a given L spectral type. The H-K colors of the later T dwarfs also show some scatter which we suggest is due to variations in pressure--induced H2 opacity, which is sensitive to gravity (or age for a brown dwarf) and metallicity.

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