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The Effects of Atmospheric Calibration Errors on Source Model Parameters
Optical long-baseline interferometric data is commonly calibrated with respect to an external calibrator, which is either an unresolved source or a star with a known angular diameter. A typical observational strategy involves acquiring data in a sequence of calibrator-target pairs, where the observation of each source is obtained separately. Therefore, the atmospheric variations that have time scales shorter than the cadence between the target-calibrator pairs are not always fully removed from the data even after calibration. This results in calibrated observations of a target star that contain unknown quantities of residual atmospheric variations. We describe how Monte Carlo simulations can be used to assess quantitatively the impact of atmospheric variations on fitted model parameters, such as angular diameters of uniform-disk models representing semi- and fully-resolved single stars.
Advances in Stellar Interferometry
Proceedings of SPIE present the original research papers presented at SPIE conferences and other high-quality conferences in the broad-ranging fields of optics and photonics. These books provide prompt access to the latest innovations in research and technology in their respective fields. Proceedings of SPIE are among the most cited references in patent literature.
Atmospheric Fluctuations
Observations of path length fluctuations from a star to a two-telescope spatial interferometer at 11-micron wavelength, and also measurements of path length fluctuations 3 m above the ground by laser distance interferometers are presented. They show substantial deviations from theoretical models such as Kolmogorov turbulence combined with Taylor's 'frozen atmosphere' swept past the observer by winds. It is found that large-aperture telescopes or long baseline interferometry, particularly for IR wavelengths, will often provide better imaging than is expected on the basis of the common assumption that relative fluctuations in path lengths through the atmosphere increase with the 5/3 power of their separation. The results are also favorable for adaptive optics.
Detection of a Geostationary Satellite with the Navy Prototype Optical Interferometer
"We have detected a satellite via optical interferometry for the first time, using a 16 m baseline of the Navy Prototype Optical Interferometer (NPOI) to observe the geostationary communications satellite DirecTV-9S during the "glint" seasons of February-March 2008 and 2009 when the sun-satellite-NPOI geometry was favorable for causing specular reflections from geostationary satellites. We used the US Naval Observatory Flagstaff Station 1 m telescope to generate accurate positions for steering the NPOI. Stars are the easiest targets for optical/infrared interferometers because of their high surface brightness. Low surface brightness targets are more difficult: if they are small enough not to...
Japan As Number One
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