Recent astronomical results from COAST

John S. Young; John E. Baldwin; Roger C. Boysen; Amanda V. George; Christopher A. Haniff; Craig D. Mackay; Debbie Pearson; John Rogers; Peter J. Warner; Donald M. A. Wilson; Richard W. Wilson

doi:10.1117/12.390242

5 July 2000 Recent astronomical results from COAST

John S. Young, John E. Baldwin, Roger C. Boysen, Amanda V. George, Christopher A. Haniff, Craig D. Mackay, Debbie Pearson, John Rogers, Peter J. Warner, Donald M. A. Wilson, Richard W. Wilson

Author Affiliations +

Proceedings Volume 4006, Interferometry in Optical Astronomy; (2000) https://doi.org/10.1117/12.390242
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

Abstract

We present the latest astronomical results from the Cambridge Optical Aperture Synthesis Telescope (COAST). COAST is a first-generation stellar interferometer, which uses an array of small (40 cm) separated telescopes to perform high-resolution imaging at visible and near-infrared wavelengths. The new science results from COAST exploit two recently-added capabilities of the COAST array, namely the ability to observe in any over the infrared J, H and K bands as well as at visible wavelengths, plus operation with five telescopes. We present contemporaneous observations of the red supergiant Betelgeuse at three wavelengths in the red and near-infrared. These data show that the apparent symmetry of the stellar disk is a strong function of wavelength, but that the bright spots seen in visible light are consistent with a convective origin. Data obtained using all five array elements on the symbiotic star CH Cygni reveal an elliptical distortion of the disk of the red giant, possibly related to mass transfer of a compact companion.

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John S. Young, John E. Baldwin, Roger C. Boysen, Amanda V. George, Christopher A. Haniff, Craig D. Mackay, Debbie Pearson, John Rogers, Peter J. Warner, Donald M. A. Wilson, and Richard W. Wilson "Recent astronomical results from COAST", Proc. SPIE 4006, Interferometry in Optical Astronomy, (5 July 2000); https://doi.org/10.1117/12.390242

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