The Nonspherical Shape of Betelgeuse in the Mid-Infrared

Details The Nonspherical Shape of Betelgeuse in the Mid-Infrared The Nonspherical Shape of Betelgeuse in the Mid-Infrared

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...670l..21t&link_type=abstract

The Astrophysical Journal, Volume 670, Issue 1, pp. L21-L24.

Astronomy and Astrophysics

Astronomy

15

Infrared: Stars, Stars: Individual (Alpha Orionis), Stars: Late-Type, Techniques: Interferometric

Scientific paper

Three-telescope interferometric observations from the Infrared Spatial Interferometer (ISI) are reported at spatial frequencies that resolve the size and shape of the star Betelgeuse (α Ori) at a wavelength of 11.15 μm with a bandwidth of 0.18 cm-1. The data include closure phase measurements, the first such measurements of a stellar disk in the mid-infrared. The data indicate a clear asymmetry of the stellar surface at these wavelengths. Mechanisms for generating the observed asymmetry via an elliptical shape or a hot spot near the southern limb of the star are discussed.

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