Brown Dwarf Binaries as Tests of Substellar Evolution

Details Brown Dwarf Binaries as Tests of Substellar Evolution Brown Dwarf Binaries as Tests of Substellar Evolution

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9499m&link_type=abstract

HST Proposal ID #9499

Physics

Optics

Hst Proposal Id #9499

Scientific paper

We propose to obtain STIS spectroscopy of two brown dwarf binaries for which dynamical masses are being obtained by monitoring the orbital motion using ground-based telescopes with adaptive optics. The HST/STIS spectra will allow to study the LiI resonance line at 670.8 nm. The lithium depletion of the members of these binaries will be estimated with the aid of synthetic spectra. These observations will be compared to model predictions of lithium depletion as a function of age and mass, and hence will provide an observational test to the theory of substellar objects. Spin-offs will be the measurement of the strength of Halpha emission, an indicator of chromospheric activity in cool atmospheres, and comparing the shape of the optical continuum with model spectra with different dust opacities.

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