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Hydrogen profiles, helium line strengths, and surface gravities of eclipsing binary stars
Coude spectroscopy and four-color photometry are used to show thatsurface gravities of eclipsing binary stars determined from hydrogenline profiles and from theoretical profile grids are in agreement withgravities based on binary light and radial velocity solutions. Agreementis obtained with both the Griem and the Vidal-Cooper-Smithline-broadening theories. Agreement is also found for gravitiesdetermined from neutral helium line strengths for N(He)/N(H) equals 0.1.
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