Physics – Optics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343210h&link_type=abstract
American Astronomical Society, AAS Meeting #213, #432.10; Bulletin of the American Astronomical Society, Vol. 41, p.300
Physics
Optics
1
Scientific paper
Adaptive Optics (AO) is often used to search nearby stars for faint companions such as brown dwarfs and extrasolar planets. A true companion can be distinguished from a faint background star by the fact that it will share the proper motion of the primary. This proper motion confirmation can be achieved with a shorter temporal baseline and higher confidence if precise astrometry is available. We present observations of bright binary stars that can aid in the astrometric calibration of AO instruments, and suggest methods to overcome some of the obstacles to precise calibration. Further, we suggest that AO astrometry is a powerful tool for studying the binary stars themselves. Even in the case of binaries wide enough to be resolved with seeing-limited observations, AO allows the orbits to be determined with superior precision. This is especially true of observations in the long wavelength L’ and M bands, where AO correction is at its best, rendering symmetrical diffraction-limited images over a relatively wide field of view.
Heinze Aren
Hinz Philip M.
Sivanandam Suresh
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