Group-delay tracking and visibility fluctuations in long-baseline stellar interferometry

Details Group-delay tracking and visibility fluctuations in long-baseline stellar interferometry Group-delay tracking and visibility fluctuations in long-baseline stellar interferometry

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.304..218l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 304, Issue 1, pp. 218-224.

Astronomy and Astrophysics

Astronomy

3

Instrumentation: Interferometers, Methods: Observational, Techniques: Interferometric

Scientific paper

We investigate the limitations of group-delay fringe tracking for stellar interferometry in the presence of realistic fluctuations of the fringe visibility amplitude. These fluctuations can be considered as introducing an additional source of noise beyond those attributable to counting statistics and detector readout, and lead to a significant increase in the probability of tracking failure compared with previous studies. We show that even for relatively bright targets, the probability of tracking loss can remain very high (>0.5) unless the seeing conditions are favourable.

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