Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...211..198g&link_type=abstract
Astrophysical Journal, vol. 211, Jan. 1, 1977, pt. 1, p. 198-206. Research supported by the National Research Council of Canada
Astronomy and Astrophysics
Astrophysics
55
A Stars, Fourier Analysis, Line Spectra, Spectrum Analysis, Stellar Rotation, Stellar Spectra, Early Stars, Fourier Transformation, Limb Darkening, Sidelobes
Scientific paper
Photoelectric line-profile measurements of the Mg II line at 4481 A and the Fe II line at 4352 A in the A stars Alpha Aql, Alpha Peg, Beta Eri, Alpha Cep, Gamma Boo, and Gamma Her are subjected to Fourier analysis in order to detect differential rotation. Effects of limb darkening on a rotationally broadened line profile are considered and compared with those of differential rotation. In the analysis, a measured rotationally broadened flux profile is expressed as a convolution of the rotation profile, and the existence of differential rotation is identified by finding a line-profile transform having an anomalously small ratio of first to second sidelobe amplitudes. The results indicate that differential rotation is apparently absent in A stars
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