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| Paper: |
Spectral Line Profile Variability as a Probe for lambda and MU |
| Volume: |
135, A Half Century of Stellar Pulsation Interpretations: a Tribute to Arthur N. Cox |
| Page: |
99 |
| Authors: |
Schrijvers, C.; Telting, J. |
| Abstract: |
We investigate the observable spectroscopic characteristics of non-radial pulsations by means of Fourier analysis of the line-profile variations. We show that the intensity variations in time series of theoretical spectra, at each position in the line profile, cannot be described by a single sinusoid: at least the second harmonic needs to be included. Across the line profile the relative amplitudes and phases of both sinusoids vary independently. The blue-to-red phase difference found at the main pulsation frequency turns out to be an indicator of the degree l, rather than the azimuthal order |m|; the phase difference of the variations with the first (m harmonic) frequency is an indicator of |m|. Hence, the evaluation of the variability at the harmonic frequency can improve the results derived from an analysis of observed line profiles. References: Schrijvers et al. 1997, A&AS, Feb issue (paper I) Telting, Schrijvers, 1997, (paper II) Telting, Schrijvers, 1997, (paper III) |
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