Abstract
view Abstract Citations (5) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Fourier analysis technique for measuring photospheric expansion in early-type stars. Ebbets, D. Abstract 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. Publication: The Astrophysical Journal Pub Date: August 1978 DOI: 10.1086/156364 Bibcode: 1978ApJ...224..185E Keywords: Absorption Spectra; Early Stars; Fourier Analysis; Photosphere; Stellar Atmospheres; Atmospheric Models; Line Spectra; O Stars; Supergiant Stars; Astrophysics; Early-Type Stars:Photospheres; Expansion:Stellar Photospheres; Line Profiles:Stellar Photospheres full text sources ADS |
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