Abstract
ABSTRACT Comparisons are made among high-resolution line-profile measurements of Fe I 6065 and 6253 wavelengths in the spectrum of Arcturus. The line-profile measurements were made with four entirely different sets of equipment in order to have a leverage on external errors; three coude spectrographs and one Fourier transform spectrometer are used. The results indicate consistency in line shape to about 1% but zero-level differences of 2-5%. This represents a substantial improvement over the accuracy attained in the past decades. Reference profiles are tabulated for comparison by future observers.
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