Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283.1027c&link_type=abstract
Astronomy and Astrophysics, Vol. 283, NO. 3/MAR(III), P.1027, 1994
Astronomy and Astrophysics
Astrophysics
22
Atmospheric Effects - Instrumentation: Interferometers - Methods: Observational - Techniques: Interferometric - Astrometry - Stars: Alpha Gem
Scientific paper
Measurements were made with the Mark III stellar interferometer in order to verify predictions for the accuracy of very-narrow-angle interferometric astrometry. The Mark III was modified to observe simultaneously on its 12-m baseline the phase of the fringe packets of the primary and secondary of the long-period visual binary star α Gem. The residuals of the phase difference between primary and secondary were analyzed for 6 data segments taken over two nights. Examination of the Allan variances of the data out to a measurement limit of 8 min indicates that the error is white, as predicted. The mean fluctuations of the residuals corresponds to an astrometric accuracy of 21 μas/√h, which is in good agreement with the predictions of atmospheric models. An accurate separation for Gem was also determined: 3".2811±0".01 at position angle 73°.23±0°.15 for B1992.9589.
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