Surface imaging of late-type stars

Details Surface imaging of late-type stars Surface imaging of late-type stars

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...230..363p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 230, no. 2, April 1990, p. 363-370.

Astronomy and Astrophysics

Astrophysics

107

Imaging Techniques, Late Stars, Stellar Structure, Surface Properties, Giant Stars, Stellar Atmospheres, Stellar Models

Scientific paper

The basic principles of stellar surface imaging techniques are discussed, and two ways of regularizing this ill-posed inverse problem are compared. Maximizing the information entropy means that minimum correlation between different points at the stellar surface should be expected, while the use of a Tikhonov regularization functional leads to the smoothest possible solution. Physical conditions in the stellar surface layers may favor the latter method, and the present simulation experiment shows that it does not produce small size, high contrast features below the spatial and temporal resolution of the data, which is typical of maximum entropy images. The technique is also illustrated by applying it to the FK Comae-type star HD 32918.

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