Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..200a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 1, 1983, p. 200-210. Research supported by the University of Tole
Astronomy and Astrophysics
Astrophysics
13
Eclipsing Binary Stars, Stellar Rotation, Stellar Spectra, Brightness Distribution, Data Reduction, Line Spectra, Spectral Line Width, Stellar Structure, Velocity Distribution
Scientific paper
New spectroscopic observations of the W UMa star AW Ursae Majoris are interpreted by retrieving the star's continuum Doppler redistribution function through the Fourier deconvolution of broadened strong lines by a standard flux profile, and the star's shape and surface brightness distribution are derived. The graphical approach to rotation broadening is briefly reviewed, and the implicit assumptions are stated. The observations and data reduction method are described, and the assumption that the locally emitted spectral profile is uniform over the stellar surface is examined. The Doppler redistribution functions obtained for AW UMa are consistently too narrow and asymmetric for the assumed geometry of the system. It is concluded that a large fraction of the primary component is covered with a solarlike plage centered on the side away from the secondary, which radically alters the local line equivalent widths.
Anderson Lauren
Leininger D.
Stanford Douglas
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