Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...477..337e&link_type=abstract
Astronomy and Astrophysics, Volume 477, Issue 1, January I 2008, pp.337-344
Astronomy and Astrophysics
Astrophysics
3
Instrumentation: Interferometers, Atmospheric Effects
Scientific paper
Context: Extending the potential of multi-aperture telescopes toward the higher magnitudes necessary for extragalactic science needs an off-axis reference source to cophase the interferometric array. Aims: The off-axis reference star and the science source must be within the isopistonic angle, and evaluating this parameter is crucial for estimating the potential of long-baseline interferometers for faint sources, differential astrometry, and phase-reference imaging. Methods: We derived an analytical method of deducing the isopistonic angle from the standard atmospheric optical parameters, and used a full description of the atmospheric turbulence to validate numerical integrations. Results: We used the analytical expression for the isopistonic angle for predictions concerning the VLT, Keck, and LBT interferometers, as well as for an array of small apertures in the Antarctica site Dome C, indicating that is might be a unique site on earth for interferometric observations of faint sources.
Benkhaldoun Zouhai
Elazhari Youssef
Elhalkouj T.
Lazrek Mohamed
Petrov Romain G.
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