Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..185e&link_type=abstract
Astrophysical Journal, Part 1, vol. 224, Aug. 15, 1978, p. 185-192.
Astronomy and Astrophysics
Astrophysics
5
Absorption Spectra, Early Stars, Fourier Analysis, Photosphere, Stellar Atmospheres, Atmospheric Models, Line Spectra, O Stars, Supergiant Stars
Scientific paper
The modern technique of Fourier transform analysis of stellar absorption-line profiles has been applied to the study of weak lines broadened asymmetrically by an expanding or contracting photosphere. From a simple geometrical model of the motions, an appropriate broadening function is derived. The complex Fourier transform is shown to contain a significant imaginary part, which contains signatures easily related to the velocity. The technique is demonstrated by broadening a He I line from an O-type supergiant model atmosphere with several values of the expansion velocity. The effects on both the profile and its transform are clearly demonstrated.
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