Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pobeo..49...41j&link_type=abstract
Publications de l'Observatoire Astronomique de Beograd, No. 49, p. 41 - 56
Astronomy and Astrophysics
Astronomy
Solar-Type Stars: Imaging, Solar-Type Stars: Image Reconstruction, Solar-Type Stars: Stellar Rotation
Scientific paper
In the past decade the methods of tomographic imaging proved to be a powerful tool to spatially resolve the surface and environment of stars. These techniques of indirect stellar imaging from photometry and spectroscopy allow to obtain, from the light curve and line profile disturbances, an information about spatial distribution of quasistationary structures in stellar atmospheres and environments. The authors describe the scientific interest for tomographic interpretation of temporal photometric or spectroscopic variability along the rotational phase of solar-type stars. The basic principle of tomographic imaging of stellar surfaces is described, as well as the problem of regularization arising from the ill-posed nature of the inversion. The authors present the practical application based on data obtained from MUlti SIte COntinuous Spectroscopy (MUSICOS) international network of high resolution spectrometers around the world and they discuss the importance of such a program for systematic observations of long term spectroscopic and photometric variations of solar-type stars for the study of starspot distribution, active region evolution, differential motions and cyclic activity on time scales of several years and decades, in order to provide the stellar equivalent to the study of solar activity.
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