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- W2049853606 abstract "We present bisector measurements of the Hline of the rapidly oscillating Ap (roAp) star, � Cir, obtained from dual-site observations with medium-dispersion spec- trographs. The velocity amplitude and phase of the principal pulsation mode vary sig- nificantly, depending on the height in the Hline, including a phase reversal between the core and the wings of the line. This supports the theory, suggested in Paper I, of a radial pulsational node in the atmosphere of the star. Blending with metal lines partially affects the Hbisector results but probably not enough to explain the phase reversal. We have also detected changes in the equivalent-width of the line during the pulsation, and measured the oscillatory signal as a function of wavelength across the Hregion." @default.
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- W2049853606 date "1999-01-11" @default.
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- W2049853606 title "Spectroscopy of the roAp star Cir - II. The bisector and equivalent width of the H line" @default.
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- W2049853606 doi "https://doi.org/10.1046/j.1365-8711.1999.02130.x" @default.
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