Doppler Imaging with a Clean-Like Approach - Part One - a Newly Developed Algorithm Simulations and Tests

Details Doppler Imaging with a Clean-Like Approach - Part One - a Newly Developed Algorithm Simulations and Tests Doppler Imaging with a Clean-Like Approach - Part One - a Newly Developed Algorithm Simulations and Tests

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274..851k&link_type=abstract

Astronomy and Astrophysics, Vol. 274, NO. 3/JUL(III), P. 851, 1993

Astronomy and Astrophysics

Astrophysics

28

Methods: Numerical, Stars: Imaging, Stars: Activity, Stars: Late-Type, Stars: Rotation

Scientific paper

A newly developed method for the Doppler imaging of star spot distributions on active late-type stars is presented. It comprises an algorithm particularly adapted to the (discrete) Doppler imaging problem (including eclipses) and is very efficient in determining the positions and shapes of star spots. A variety of tests demonstrates the capabilities as well as the limitations of the method by investigating the effects that uncertainties in various stellar parameters have on the image reconstruction. Any systematic errors within the reconstructed image are found to be a result of the ill-posed nature of the Doppler imaging problem and not a consequence of the adopted approach. The largest uncertainties are found with respect to the dynamical range of the image (brightness or temperature contrast). This kind of uncertainty is of little effect for studies of star spot migrations with the objectives of determining differential rotation and butterfly diagrams for late-type stars.

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