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Proceedings Paper

Detection of stellar velocity fields from line profile analysis
Author(s): Myron A. Smith
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Paper Abstract

Recent advances in the study of velocity fields in stellar atmospheres made possible by the development of solid-state diode arrays are reviewed. The Fourier transform is considered as a tool for exploring broadening of lines by rotation and turbulent velocities, and a few examples of broadened profiles are presented. It is noted that in matching models with observations, velocity shifts from each of the expected velocities should be computed point by point across a model stellar disk and coadded. It is pointed out that rotation tends to amplify asymmetries in profiles produced by granulation cells on star surfaces. Attention is focused on processes in hot stars arising from nonradial pulsations and the acceleration of blobs embedded in the outward flowing escape of the radiative wind.

Paper Details

Date Published: 1 December 1990
PDF: 10 pages
Proc. SPIE 1318, Optical Spectroscopic Instrumentation and Techniques for the 1990s: Applications in Astronomy, Chemistry, and Physics, (1 December 1990); doi: 10.1117/12.22106
Show Author Affiliations
Myron A. Smith, Computer Sciences Corp. (United States)


Published in SPIE Proceedings Vol. 1318:
Optical Spectroscopic Instrumentation and Techniques for the 1990s: Applications in Astronomy, Chemistry, and Physics
Bernard J. McNamara; Jeremy M. Lerner, Editor(s)

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