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Proceedings Paper

Mid-infrared interferometry with high spectral resolution
Author(s): Edward H. Wishnow; William Mallard; Vikram Ravi; Sean Lockwood; Walt Fitelson; Dan Wertheimer; Charles H. Townes
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Paper Abstract

The Infrared Spatial Interferometer (ISI) is a three telescope interferometer system that operates near 11 microns wavelength using heterodyne detection with CO2 lasers as local oscillators. Stellar measurements have been made using consistent instrumentation for 20 years, allowing comparisons of stellar sizes of red giant and Mira stars over time intervals which are long in comparison to stellar luminosity periods. Recent visibility and closure phase measurements of the star Betelgeuse have been fitted to simple image models and these results have been added to the 17 year record of stellar observations. A new area of investigation of stellar properties at very high spectral resolution will begin in the 2010-2011 observing season. The design of a new digital spectrometer-correlator system is discussed. This system will obtain visibility measurements on-and-off individual spectral lines and the continuum, simultaneously.

Paper Details

Date Published: 21 July 2010
PDF: 10 pages
Proc. SPIE 7734, Optical and Infrared Interferometry II, 773409 (21 July 2010); doi: 10.1117/12.857656
Show Author Affiliations
Edward H. Wishnow, Univ. of California, Berkeley (United States)
William Mallard, Univ. of California, Berkeley (United States)
Vikram Ravi, Univ. of California, Berkeley (United States)
Sean Lockwood, Univ. of California, Berkeley (United States)
Walt Fitelson, Univ. of California, Berkeley (United States)
Dan Wertheimer, Univ. of California, Berkeley (United States)
Charles H. Townes, Univ. of California, Berkeley (United States)

Published in SPIE Proceedings Vol. 7734:
Optical and Infrared Interferometry II
William C. Danchi; Françoise Delplancke; Jayadev K. Rajagopal, Editor(s)

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