Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...208..179r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 208, no. 1-2, Jan. 1989, p. 179-188. Research supported by NSERC.
Astronomy and Astrophysics
Astrophysics
98
A Stars, Doppler Effect, Mapping, Peculiar Stars, Image Reconstruction, Iron, Line Spectra, Red Shift, Spectral Line Width, Stellar Magnetic Fields, Stellar Rotation
Scientific paper
The capabilities and limitations of solution of the inverse problem to derive maps of the surfaces of stars from observed line profiles are discussed and demonstrated with examples. In particular, it is shown that the solution of Goncharsky et al. (1977, 1982) recovers the available information on the distribution in latitude. There are important intrinsic limitations on the reconstruction of features near the equator, and in the hemisphere in which the rotational pole is hidden. It is also shown that failure to correctly represent the local line profiles on the star in the process of solution may lead to substantial errors in the derived maps. Maps of the equivalent widths of three Fe lines derived from observed line profiles for Epsilon Ursae Majoris are shown. A tentative interpretation in terms of a ring and a spot is suggested.
Khokhlova V. L.
Rice John B.
Wehlau William H.
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