Physics – Optics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9157m&link_type=abstract
HST Proposal ID #9157
Physics
Optics
Hst Proposal Id #9157 Cold Stars
Scientific paper
We propose to characterize the physical properties of eight L-dwarfs in four binary systems. Our goal is to obtain astrometric, photometric and spectroscopic measurements of each component that will yield basic information on their atmospheric and dynamical properties. The high angular resolution of HST is essential because all these systems have angular separations <=0.5 arcsec. They do not have bright enough stars nearby that can be used for natural guide adaptive optics in ground-based telescopes. In Cycles 10 and 11 we propose to obtain WFPC2 and STIS data, allowing the determination of parallax, proper motion, position and spectral type for each component. In Cycle 12 we plan to obtain additional WFPC2 images for follow-up of the orbital motion and refinement of parallax and proper motion. We will also monitor possible intrinsic photometric variability in two filters {F606W and F814W}. The STIS observations will provide spectral types, gravity sensitive indicators, and chromospheric activity {H_Alpha emission} for each component. These 4 systems will constitute benchmarks for determining dynamical masses of L dwarfs, and inferring the age-mass- spectral type relationship of this new spectral class.
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