Relative Astrometry with Ground-Based Adaptive Optics Imaging

Details Relative Astrometry with Ground-Based Adaptive Optics Imaging Relative Astrometry with Ground-Based Adaptive Optics Imaging

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21421803l&link_type=abstract

American Astronomical Society, AAS Meeting #214, #218.03; Bulletin of the American Astronomical Society, Vol. 41, p.725

Physics

Optics

Scientific paper

Large ground-based telescopes equipped with adaptive optics (AO) systems have ushered in a new era of high-resolution infrared imaging and astrometry. Relative astrometric accuracies of 0.1 mas have already been demonstrated with the Keck and Palomar AO systems from infrared images with spatial resolutions of 55-95 mas resolution over 10-20'' fields of view. Future AO systems on existing (Gemini, Keck, MMT) telescopes may provide comparable astrometry over much larger fields of view (several arcminutes). The planned Thirty Meter Telescope (TMT) is designed to achieve at least 0.03 mas relative astrometric accuracy at spatial resolutions of 10 mas. These capabilities enable a unique set of experiments including the following. Orbits and dynamical masses are measured for binary asteroids, binary stars, and exoplanets. Kinematics of stars orbiting our Galaxy's central supermassive black hole can be used both to trace the dynamical history of different aged stellar populations and to search for post-Newtonian effects on the closest stellar orbits. Proper motions can be used to find all the members of young star clusters and determine precise cluster properties (e.g. IMF) and internal dynamics. These experiments and others depend on precise astrometry at the highest possible spatial resolutions with infrared wavelengths; requirements uniquely met by adaptive optics systems on large ground-based telescopes.

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