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Fourier Analysis of Line-Profile Variations: Toward Stellar m – v Diagrams?
Published online by Cambridge University Press: 15 February 2018
Abstract
Numerous rapidly rotating δ Scuti stars exhibit variable line profiles containing traveling subfeatures [l]-[2], which may be signatures of nonradial pulsations having relatively high azimuthal order |m| We describe a procedure whereby a time series of spectral line profiles is Fourier analysed both in time and in a wavelength variable that is presumed to correspond to azimuthal position Φ on the star. What such an analysis can tell us is examined by analysing artificially-generated data. For an ideal example in which sin i = 1 and a single mode having is present, the two-dimensional Fourier transform yields a power spectrum in frequency
and an apparent azimuthal order
that provides a good indication of the actual
and m. Such a straightforward interpretation is also possible when sin i < 1, and when multiple sectoral modes
are present. For tesseral modes
may correspond more closely to
than to m.
- Type
- Stellar Seismology
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- Copyright © Cambridge University Press 1993