Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219..111b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, March 1, 1986, p. 111-129.
Astronomy and Astrophysics
Astronomy
88
Line Spectra, Stellar Oscillations, Stellar Rotation, Stellar Spectra, Amplitude Distribution Analysis, Line Shape, Velocity Distribution
Scientific paper
A simple method of analyzing spectral line profiles in nonradially oscillating, rotating stars in order to determine the spherical harmonic order of the oscillation is proposed. Unlike the usual method, profile modelling is not required. Moreover, the proposed method automatically gives the periods of oscillation and provides information on the projected rotational velocity and angle of inclination. In the conventional method of analysis, these quantities are normally chosen by trial and error until the best fit is achieved. The new method requires just the first two or three moments of the line profile, involving only trivial calculations. The periodograms of these moments and Fourier amplitudes and phases of the resulting frequencies are used to determine the modes.
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