Other
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pobeo..90...91k&link_type=abstract
Publications of the Astronomical Observatory of Belgrade, vol. 90, pp. 91-96
Other
Scientific paper
Basics of the two modern indirect imaging techniques � Doppler imagi g and Doppler tomography are reviewed. They benefited the studies of stellar surface inhomogeneities and flattened disc-like structures during the last decades. The foundations of Doppler imaging lay in the fact that spottedness is the main reason for stellar variability due to rotation. Stellar rotation modulates both photometric and spectroscopic characteristics of the objects we observe, giving the possibility to reconstruct the spatial distribution of the temperature or the concentration of chemical elements over the stellar surface. Patchy surfaces are typical for many early and late type variable stars, and it is generally thought that starspots have a close connection with the stellar magnetic field geometry. Polarimetric measurements allow this geometry to be successfully reconstructed via Zeeman-Doppler method. The other modern technique, Doppler tomography, is based primarily on the strong atomic line emission, e.g. in hydrogen Balmer lines, generated by accretion discs. It transforms line profiles observed at different orbital phases of a binary star into characteristics of the emission regions over the disc or over the surface of primary component. Observational constraints of the Doppler imaging and Doppler tomography are discussed in brief.
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