High-resolution imaging of Betelgeuse and Mira

Details High-resolution imaging of Betelgeuse and Mira High-resolution imaging of Betelgeuse and Mira

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257..369w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 3, Aug. 1, 1992, p. 369-376.

Astronomy and Astrophysics

Astronomy

101

Astronomical Photography, Brightness Distribution, Giant Stars, High Resolution, Mira Variables, Supergiant Stars, Charge Coupled Devices, Companion Stars, Interferometry, Limb Darkening, Photosphere, Power Spectra

Scientific paper

Diffraction-limited images have been made of the M giant stars Alpha Orionis (Betelgeuse) and Omicron Ceti (Mira), using the nonredundant masking method at the 4.2-m William Herschel Telescope, for wavelengths between 546 and 710 nm. The brightness distribution for the surface of Betelgeuse is nonuniform, and has shown large changes over a period of 22 m. The disk of Mira is significantly elongated along position angle of 120 deg, and there is evidence that the radial intensity profile is approximately Gaussian.

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