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Title:
A Useful Approximation for Computing the Continuum Polarization of Be Stars
Authors:
McDavid, David
Affiliation:
AA(Limber Observatory, 135 Star Run, PO Box 63599, Pipe Creek TX 78063; )
Publication:
The Astrophysical Journal, Volume 553, Issue 2, pp. 1027-1035. (ApJ Homepage)
Publication Date:
06/2001
Origin:
UCP
ApJ Keywords:
Stars: Circumstellar Matter, Polarization, Scattering, Stars: Emission-Line, Be, Stars: Winds, Outflows, Techniques: Polarimetric
DOI:
10.1086/320945
Bibliographic Code:
2001ApJ...553.1027M

Abstract

This paper describes a practical model for the polarization of Be stars that can be used to estimate roughly the physical parameters for optically thin circumstellar envelopes from broadband UBVRI photopolarimetry data. Analysis of long-term variability in terms of these parameters is a promising approach toward understanding the Be phenomenon. An interesting result from fitting the model to observations of eight Be stars is that all of them may have geometrically thin disks, with opening half-angles on the order of 10° or less. This contributes to the growing evidence that most Be disks are geometrically thin.
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