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doi:10.1088/0004-637X/697/2/L127 A SYSTEMATIC CHANGE WITH TIME IN THE SIZE OF BETELGEUSE

By C. H. Townes, E. H. Wishnow, D. D. S. Hale and B. Walp

Abstract

The diameter of Betelgeuse (α Orionis) has been measured at a wavelength of 11.15 μm using the Infrared Spatial Interferometer over the past 15 years. During this 1993–2009 time period the star’s size has decreased systematically by 15%

Year: 2009
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