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Paper: Recent Observations of Betelgeuse and New Instrumentation at the ISI
Volume: 487, Resolving The Future Of Astronomy With Long-Baseline Interferometry
Page: 337
Authors: Lockwood, S.; Ravi, V.; Wishnow, E. H.; Fitelson, W.; Mallard, W.; Werthimer, D.; Mistry, H.; Townes, C. H.
Abstract: The Infrared Spatial Interferometer (ISI) has been conducting mid-infrared observations of late-type stars for about 18 years. A long-term set of diameter measurements of Betelgeuse at 11.15 μm shows pronounced changes in the stellar size over time. These changes may arise from variations in the opacity of the environment immediately surrounding the star. New instrumentation is being developed to identify the composition and kinematics of the circumstellar environment of Betelgeuse, and of other late-type stars. A digital spectrometer-correlator is being built and tested that will enable visibility measurements on and off individual molecular spectral lines. Results from testing the spectrometer system are presented.
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