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Two-dimensional images of Alpha Orionis

1986; IOP Publishing; Volume: 309; Linguagem: Inglês

10.1086/164644

1538-4357

J. C. Hebden, Julian C. Christou, A. Cheng, E. K. Hege, P. A. Strittmatter, J. M. Beckers, H. P. Murphy,

Astronomical Observations and Instrumentation

view Abstract Citations (24) References (36) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Two-dimensional Images of Alpha Orionis Hebden, J. C. ; Christou, J. C. ; Cheng, A. Y. S. ; Hege, E. K. ; Strittmatter, P. A. ; Beckers, J. M. ; Murphy, H. P. 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 full text sources ADS | data products SIMBAD (2)