Recent astronomical results from the infrared spatial interferometer and their implications for LOUISA

Details Recent astronomical results from the infrared spatial interferometer and their implications for LOUISA Recent astronomical results from the infrared spatial interferometer and their implications for LOUISA

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nascp3066...75d&link_type=abstract

In New Mexico Univ., A Lunar Optical-Ultraviolet-Infrared Synthesis Array (LOUISA) p 75-92 (SEE N93-13579 03-89)

Astronomy and Astrophysics

Astronomy

Atmospheric Windows, Heterodyning, Infrared Interferometers, Synthetic Apertures, Telescopes, Astronomy, Brightness, Earth Rotation, Infrared Imagery, Interferometry, Late Stars, Signal To Noise Ratios

Scientific paper

A new heterodyne interferometer for the atmospheric window from 9 to 12 microns was developed during the past five years. This instrument, called the Infrared Spatial Interferometer (ISI), was designed to use earth rotation aperture synthesis techniques developed in radio interferometry. It was moved to Mt. Wilson, California, in January 1988 and first fringes were obtained in June of that year. Systematic observations of some of the brighter late-type stars began shortly after the first fringes were obtained. We describe the basic principles and design of the ISI and give an overview of some of the initial results obtained from these observations. The implications of our work to the proposed Lunar Optical/UV/IR Synthesis Array (LOUISA) are discussed. We also analyze the conditions for the maximum signal-to-noise ratio of such an interferometer as a function of wavelength. The optimum wavelength is found to depend on the assumed scaling relation between telescope area and wavelength.

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