Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.189..671m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 189, Dec. 1979, p. 671-699. Research supported by the Science Research
Astronomy and Astrophysics
Astronomy
27
Angular Velocity, Line Shape, Spectral Line Width, Stellar Atmospheres, Stellar Rotation, Atmospheric Models, Early Stars, Flow Velocity, Photosphere, Stellar Models, Velocity Distribution, Velocity Measurement
Scientific paper
A study of diagnosing velocity fields in expanding and rotating stellar atmospheres is presented. Line profiles are calculated by solving for the source function in the comoving fluid frame, and computing emergent intensities using a formal solution in the observer's frame. Results are presented for equivalent widths, line depth, line shift, line width, and asymmetry parameters, and it is shown that the standard curve of growth cannot yield unique physically meaningful results. Line-shape parameters appear to provide sufficient information to estimate the broad features of the flow, and it is shown that a fundamental assumption upon which all present Fourier methods are based is invalid. Possible approaches for overcoming the problem are suggested.
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