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Physics and Astronomy Dissertations

CHARA

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Full-Text Articles in Physical Sciences and Mathematics

The Self-Calibration Method For Multiple Systems At The Chara Array, David P. O'Brien May 2011

The Self-Calibration Method For Multiple Systems At The Chara Array, David P. O'Brien

Physics and Astronomy Dissertations

The self-calibration method, a new interferometric technique using measurements in the K′-band (2.1 μm) at the CHARA Array, has been used to derive orbits for several spectroscopic binaries. This method uses the wide component of a hierarchical triple system to calibrate visibility measurements of the triple’s close binary system through quasi-simultaneous observations of the separated fringe packets of both. Prior to the onset of this project, the reduction of separated fringe packet data had never included the goal of deriving visibilities for both fringe packets, so new data reduction software has been written. Visibilities obtained with separated fringe packet data …


A Prototype Visible To Near-Infrared Spectrograph For The Chara Array, A Long-Baseline Stellar Interferometer, Chad Elliott Ogden Jan 2006

A Prototype Visible To Near-Infrared Spectrograph For The Chara Array, A Long-Baseline Stellar Interferometer, Chad Elliott Ogden

Physics and Astronomy Dissertations

This work is a description of the Visible to near Infrared Spectrograph system for the CHARA array. The CHARA Array is a 6-telescope interferometer at the Mount Wilson Observatory in the mountains north of Pasadena, California. It combines the light from the 1-meter telescopes, and measures the visibility of the resulting interference fringes, which gives information about the source intensity distribution on the sky. The resolution of the instrument is proportional to the telescope separation, or baseline, divided by the wavelength. The VIS system operates in the 600-1000~nm wavelength range, a factor of 3 to 4 shorter than the standard …