High-resolution imaging of Betelgeuse and Mira.
Abstract
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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- August 1992
- DOI:
- 10.1093/mnras/257.3.369
- Bibcode:
- 1992MNRAS.257..369W
- Keywords:
-
- Astronomical Photography;
- Brightness Distribution;
- Giant Stars;
- High Resolution;
- Mira Variables;
- Supergiant Stars;
- Charge Coupled Devices;
- Companion Stars;
- Interferometry;
- Limb Darkening;
- Photosphere;
- Power Spectra;
- Astronomy