Physics – Optics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..609u&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, July 1985, p. 609-615.
Physics
Optics
6
Atmospheric Optics, Charge Coupled Devices, Stellar Motions, Supergiant Stars, Telescopes, Atmospheric Temperature, Cassegrain Optics, Optical Paths, Power Spectra, Temperature Measurement, Wind Velocity
Scientific paper
A transportable 30-cm aperture telescope was constructed and used with a CCD camera to measure stellar image motion as seen from the summit of Mount Graham in southeastern Arizona. Based on observations during eight nights in October and November 1984, the average value of Fried's length r0 (Fried, 1967) at 0.5 micron wavelength is 13 cm at the zenith, implying a long-exposure visual image full width at half maximum of 0.8 arc second. Since only a small number of nights have been tested, the statistical uncertainty in the average seeing conditions is large and these results should be regarded as preliminary. No large differences were found among three different sites or between different heights of the telescope above the ground. Direct measurements of thermal turbulence in the first few tens of meters above ground indicate that telescopes may be located within a few meters of the ground and well below treetop height without significant seeing degradation.
Davison Warren B.
Ulich Bobby L.
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