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A SYSTEMATIC CHANGE WITH TIME IN THE SIZE OF BETELGEUSE

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C. H. Townes1, E. H. Wishnow1, D. D. S. Hale2 and B. Walp1

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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%.


Keywords

stars: general; stars: individual (Betelgeuse); techniques: interferometric


PACS

97.21.+a Pre-main sequence objects, young stellar objects (YSO's) and protostars (T Tauri stars, Orion population, Herbig–Haro objects, Bok globules, bipolar outflows, cometary nebulae, etc.)

95.55.Br Astrometric and interferometric instruments

95.75.Kk Interferometry

Subjects

Instrumentation and measurement

Astrophysics and astroparticles

Dates

Issue 2 (2009 June 1)

Received 2009 March 9, accepted for publication 2009 April 20

Published 2009 May 11



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