Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasp..116..876c&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 116, Issue 823, pp. 876-885.
Astronomy and Astrophysics
Astronomy
13
Atmospheric Effects, Instrumentation: Interferometers, Techniques: Interferometric
Scientific paper
Water vapor, while usually a small contributor to the atmospheric refractive index for astronomical observations at IR wavelengths, is highly dispersive and can introduce optical path length errors affecting high-precision interferometer observing modes. The refractive index of atmospheric water vapor can be computed from a summation over the various IR resonances, and we present values over a range of 1.2-13.5 μm. The dispersion of water vapor introduces phase errors across the instrument passband and produces excess noise in interferometer group delay, residual errors in cophasing using a different source wavelength, and coherence loss over broad optical bandwidths. We quantify these effects for the J through N bands, discuss means of amelioration, and consider their implications for differential phase and nulling observing modes.
Akeson Rachel Lynn
Colavita Mark M.
Hill Reginald J.
Koresko Christopher D.
Swain Mark Raboin
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