Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21421804r&link_type=abstract
American Astronomical Society, AAS Meeting #214, #218.04; Bulletin of the American Astronomical Society, Vol. 41, p.725
Astronomy and Astrophysics
Astronomy
Scientific paper
With the world's longest baselines for optical and near-infrared interferometry, the CHARA Array can reach sub-milliarcsecond resolutions, enabling the highest precision of ground-based astrometry. Calibrated visibility measurements have helped derive visual orbits and component masses for select short-period spectroscopic binaries with periods of only a few days, a regime that is uniquely suited for resolution with CHARA. Separated fringe packet analysis has been utilized as an efficient method for survey projects that have searched for new stellar companions with separations of 10-120 mas, as well as for the astrometric measurements for such pairs. Close hierarchical triple systems, composed of a relatively wide visual pair, one component of which is a spectroscopic binary, have been observed as "self-calibration” systems to derive orbits and masses. Closure-phase analysis has enabled binary-motions to be imaged. In this talk, I will present some recent science results from these techniques and discuss ongoing astrometric efforts at the Array.
Henry Todd J.
McAlister Harold A.
O'Brien Darren
Raghavan Deepak
ten Brummelaar Theo A.
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