Two-dimensional Images of Alpha Orionis
Abstract
Between February 1981 and December 1983 a series of speckle interferometric observations were made of the M-type supergiant Alpha Orionis in an attempt to produce two-dimensional images of the star at the H-alpha line. Two types of data reduction techniques were used: (1) shift-and-add methods applied to conventional speckle interferometric observations, and (2) differential speckle interferometry. Data analysis included the application of the CLEAN algorithm to calibrate the images produced by the shift-and-add technique with data reduced similarly for a point source. The images produced are encouragingly consistent in suggesting asymmetric atmospheric structure; possible evolution of that structure over the three-year period of observations is noted.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- October 1986
- DOI:
- 10.1086/164644
- Bibcode:
- 1986ApJ...309..745H
- Keywords:
-
- Image Processing;
- M Stars;
- Red Giant Stars;
- Supergiant Stars;
- Fourier Transformation;
- Image Reconstruction;
- Interferometry;
- Weighting Functions;
- Astrophysics;
- INTERFEROMETRY;
- STARS: INDIVIDUAL CONSTELLATION NAME: ALPHA ORIONIS