The H-alpha chromosphere of Alpha Orionis

Details The H-alpha chromosphere of Alpha Orionis The H-alpha chromosphere of Alpha Orionis

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314..690h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 15, 1987, p. 690-698.

Astronomy and Astrophysics

Astrophysics

25

Chromosphere, Stellar Atmospheres, Supergiant Stars, Absorption Spectra, H Alpha Line, Image Reconstruction, Optical Thickness, Speckle Interferometry, Stellar Envelopes

Scientific paper

Images have been obtained of the H-alpha chromospheric envelope of Alpha Ori at the diffraction-limited resolution of the cophased Multiple Mirror Telescope. A phaseless image reconstruction was applied to speckle interferometric data obtained at continuum wavelengths, and the result was used to produce images of the highly extended H-alpha region from results achieved using the differential imaging technique. Two such images are presented which were obtained from observations made almost 2 yr apart. Significant, and highly isotropic emission out to several stellar radii is exhibited. A very large optical depth in H-alpha is indicated. A simple mathematical expression for the radially averaged profile of the images is derived empirically.

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