Other
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..565v&link_type=abstract
(Astronomical Society of the Pacific, Symposium on the Renaissance in High-Resolution Spectroscopy - New Techniques, New Frontie
Other
254
Binary Stars, Imaging Techniques, Starspots, Coronal Holes, Doppler Effect, Line Spectra, Mapping, Stellar Rotation
Scientific paper
A technique for imaging the surfaces of certain rapidly rotating spotted stars is discussed. The method exploits the correspondence between wavelength position across a rotationally broadened spectral line and spatial position across the stellar disk. Preliminary Doppler Images of the RS CVn star HR 1099 show spots which exhibit a striking similarity in shape and location to X ray images of solar coronal holes. It is suggested that the large star spots on RS CVn's and other active late-type stars emerge at low latitude as scaled-up analogs of solar complexes, but as they migrate poleward, they more closely resemble photospheric analogs of solar coronal holes. The evolution of starspots appears remarkably similar to that of large-scale magnetic fields of the sun.
Penrod Donald G.
Vogt Stefan
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