Phase Referencing and Narrow-Angle Astrometry in Current and Future Interferometers

Details Phase Referencing and Narrow-Angle Astrometry in Current and Future Interferometers Phase Referencing and Narrow-Angle Astrometry in Current and Future Interferometers

2004-07-14

arxiv.org/abs/astro-ph/0407280v1

Astronomy and Astrophysics

Astrophysics

9 Pages, 7 figures. To appear in SPIE conference proceedings volume 5491, "New Frontiers in Stellar Interferometery"

Scientific paper

Atmospheric turbulence is a serious problem for ground-based interferometers. It places tight limits on both sensitivity and measurement precision. Phase referencing is a method to overcome these limitations via the use of a bright reference star. The Palomar Testbed Interferometer was designed to use phase referencing and so can provide a pair of phase-stabilized starlight beams to a second (science) beam combiner. We have used this capability for several interesting studies, including very narrow angle astrometry. For close (1-arcsecond) pairs of stars we are able to achieve a differential astrometric precision in the range 20-30 micro-arcseconds.

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