Other
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..167c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Nov. 1, 1991, p. 167-174.
Other
9
Absorption Spectra, Polarized Radiation, Stellar Radiation, Astronomical Models, Limb Darkening, Spectral Line Width, Stellar Magnitude, Stellar Rotation
Scientific paper
A simple (Struve-Unsold) model with limb darkening is presented to show the existence of polarization in rotationally broadened pure absorption lines and provide estimates of its magnitude. Results for more complicated models appropriate for early-type stars are considered. While the results in the visible part of the spectrum are considerably smaller in magnitude than for the simple model, the form of those results can be readily understood in terms of that model and may be detectable. Results for the UV spectra of early-type stars, while still smaller in magnitude than the Struve-Unsold model, are of opposite sign and larger in magnitude than the visible. It is inferred that it is much more likely that the effect may be detected in the UV than the visible. It is suggested that since this effect results from the axial symmetry of stellar rotation, it could provide a sensitive diagnostic for rotational broadening, allowing it to be separated from other forms of broadening that present higher forms of symmetry to the observer.
Collins George W. II
Cranmer Steven R.
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