Phase referencing and narrow-angle astrometry in current and future interferometers

Benjamin F. Lane; Matthew W. Muterspaugh

doi:10.1117/12.549440

20 October 2004 Phase referencing and narrow-angle astrometry in current and future interferometers

Benjamin F. Lane, Matthew W. Muterspaugh

Proceedings Volume 5491, New Frontiers in Stellar Interferometry; (2004) https://doi.org/10.1117/12.549440
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

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.

Citation Download Citation

Benjamin F. Lane and Matthew W. Muterspaugh "Phase referencing and narrow-angle astrometry in current and future interferometers", Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004); https://doi.org/10.1117/12.549440

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