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The conventional approach to high-precision narrow-angle astrometry using along baseline interferometer is to directly measure the fringe packetseparation of a target and a nearby reference star. This is done by means of atechnique known as phase-referencing which requires a network of dual beamcombiners and laser metrology systems. Using an alternative approach that doesnot rely on phase-referencing, the narrow-angle astrometry of several closedbinary stars (with separation less than 2$"$), as described in this paper, wascarried out by observing the fringe packet crossing event of the binarysystems. Such an event occurs twice every sidereal day when the line joiningthe two stars of the binary is is perpendicular to the projected baseline ofthe interferometer. Observation of these events is well suited for aninterferometer in Antarctica. Proof of concept observations were carried out atthe Sydney University Stellar Interferometer (SUSI) with targets selectedaccording to its geographical location. Narrow-angle astrometry using thisindirect approach has achieved sub-100 micro-arcsecond precision.

Alternative approach to precision narrow-angle astrometry for Antarctic long baseline interferometry