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Title:
A Systematic Change with Time in the Size of Betelgeuse
Authors:
Townes, C. H.; Wishnow, E. H.; Hale, D. D. S.; Walp, B.
Affiliation:
AA(Space Sciences Laboratory and Department of Physics, University of California, Berkeley, CA 94720, USA ), AB(Space Sciences Laboratory and Department of Physics, University of California, Berkeley, CA 94720, USA ), AC(Department of Astronomy, California Institute of Technology, Pasadena, CA 91125, USA ), AD(Space Sciences Laboratory and Department of Physics, University of California, Berkeley, CA 94720, USA )
Publication:
The Astrophysical Journal Letters, Volume 697, Issue 2, pp. L127-L128 (2009). (ApJL Homepage)
Publication Date:
06/2009
Origin:
IOP
Astronomy Keywords:
stars: general, stars: individual: Betelgeuse, techniques: interferometric
DOI:
10.1088/0004-637X/697/2/L127
Bibliographic Code:
2009ApJ...697L.127T

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%.
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