Metallicity and Gravity Diagnostics in the Coldest Brown Dwarf Spectra

Details Metallicity and Gravity Diagnostics in the Coldest Brown Dwarf Spectra Metallicity and Gravity Diagnostics in the Coldest Brown Dwarf Spectra

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20544b&link_type=abstract

Spitzer Proposal ID #20544

Computer Science

Scientific paper

Brown dwarf spectra are rich in diagnostics of temperature, gravity and metallicity. However, in the coldest sources, these parameters can be entangled with competing effects for a few major absorbers. We have identified three late-type T dwarfs that exhibit spectroscopic and kinematic indications of being either old, metal poor or both. We propose IRAC photometry and IRS spectroscopy of these sources to determine a means of breaking the so-called metallicity/gravity degeneracy, and to test the first generation of cold brown dwarf models exploring metallicity variations.

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