Astrometric optical interferometry with non-evacuated delay lines

Details Astrometric optical interferometry with non-evacuated delay lines Astrometric optical interferometry with non-evacuated delay lines

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..138..355d&link_type=abstract

Astronomy and Astrophysics Supplement, v.138, p.355-363

Astronomy and Astrophysics

Astrophysics

5

Athmospheric Effects, Techniques: Interferometric, Astromety

Scientific paper

The effects of longitudinal dispersion in long baseline optical interferometry with non-evacuated delay lines are analyzed. A new technique is proposed for group delay tracking, with phase measurements in two wavebands only. Sensitivity and instrumental uncertainties are further investigated, together with the dependence on stellar color temperature. To a precision level of a few 10(-10) rad, limiting factors in dual-field astrometry should be put under control with not too long interferometer baseline.

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