Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt.........4k&link_type=abstract
Thesis - Ludwig-Maximilians-Univ. Max-Planck-Inst. für Extraterrestrische Physik, Garching (Germany).
Astronomy and Astrophysics
Astronomy
4
Astrography, Convolution Integrals, Doppler Effect, Imaging Techniques, Pre-Main Sequence Stars, Stellar Structure, Discrete Functions, Fredholm Equations, Maximum Entropy Method, Photosphere, Stellar Luminosity, Stellar Rotation, Two Dimensional Bodies
Scientific paper
The development of methods for the mapping of stellar surface structures, in particular the mapping of photospheric star spot distributions on active cool stars is dealt with. Procedures of extracting information from the observational data are studied. Major attention is given to the 'Doppler imaging Method,' which enables the observer to produce detailed two dimensional images of the photospheres of rapidly rotating stars. The basis of the method is the deprojection and deconvolution of rotationally broadened profiles of stellar absorption lines. The constraint adopted consists of trying to find a 'two temperature model' of the stellar photosphere. The developed method is applied to recent observations of the rapidly rotating premain sequence star AB Doradus.
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