Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....76..208d&link_type=abstract
Astronomy and Astrophysics, vol. 76, no. 2, July 1979, p. 208-211.
Astronomy and Astrophysics
Astrophysics
4
Fourier Transformation, Line Spectra, Spectral Line Width, Spectrum Analysis, Stellar Spectra, Turbulence Effects, Wave Interaction, Opacity, Stellar Atmospheres, Velocity Distribution
Scientific paper
An attempt is made to discuss an analysis of Fourier transforms of wave-broadened spectral-line profiles in terms of microturbulence and total velocity field. Synthetic line profiles are calculated numerically and analyzed by following the procedures outlined by Gray (1975, 1976). It is concluded that: (1) the presence of a progressive wave field cannot be diagnosed directly from a mean line transform; (2) the microvelocity field derived in the Fourier domain by matching the position of the first minimum is strongly dependent on line strength; (3) the Fourier microfield and classical microturbulence are identical only for very strong lines lying at the upper end of the first portion of the curve of growth; (4) the residual macrovelocity transform is not simply describable by commonly used functions; and (5) the macrovelocity parameters can be overestimated or underestimated unless caution is exercised.
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