Applications of Narrow-Angle Astrometry at USNO

Details Applications of Narrow-Angle Astrometry at USNO Applications of Narrow-Angle Astrometry at USNO

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21421802h&link_type=abstract

American Astronomical Society, AAS Meeting #214, #218.02; Bulletin of the American Astronomical Society, Vol. 41, p.725

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Astrometry at high signal-to-noise gives relative position errors typically 2 mas in a single observation and parallax errors of 0.3 mas in data taken over several years. Targets include low luminosity and/or rare types of stars, including cool dwarfs and subdwarfs, white dwarfs, cataclysmic variables, planetary nebulae, and dwarf carbon stars. Results are used to determine luminosities, temperatures, space densities, luminosity functions, and/or masses of these types of stars. Perturbations from a binary companion are detected for some stars, then yielding orbital parameters and masses. With a reference catalog of accurate absolute positions, improved orbits of solar system bodies are determined and used by NASA and others, and absolute proper motions and improved current-epoch positions can be determined. This talk will summarize these applications and limits to current results, and future progress. Part of this work is funded by NASA.

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