Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6059s&link_type=abstract
HST Proposal ID #6059
Computer Science
Hst Proposal Id #6059 Cool Stars
Scientific paper
The imaging capabilities of the FOS, with its red Digicon detector, large dynamic range, and barred apertures, make it an ideal instrument to search for faint brown dwarfs around nearby stars. Although the FOS is generally not recognized as an imaging instrument, it does have unique imaging characteristics. The FOS is the only HST instrument that has a demonstrated occulting bar capability. Simulations show that, by placing the primary star behind the occulting bar, we can observe sub-stellar companions at m_v=22.8 within 0.8" of a typical nearby M dwarf. The ability to distinguish objects over a 10 magnitude range in brightness and at sub-arcsecond separation is unique to the FOS. We will use the FOS in image mode {0.08 arc-second pixels}, and utilize its on-board target acquisition capabilities to center the primary star behind the 0.27" bar in the large barred aperture. This program is aimed at increasing the known list of brown dwarf candidates, and at the same time, probing the low end of the stellar luminosity function.
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