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Title:
Linear polarization of H-alpha in the Be star gamma Cassiopeiae
Authors:
Poeckert, R.; Marlborough, J. M.
Affiliation:
AA(Western Ontario, University, London, Canada), AB(Western Ontario, University, London, Canada)
Publication:
Astrophysical Journal, Part 1, vol. 218, Nov. 15, 1977, p. 220-226. Research supported by the National Research Council of Canada. (ApJ Homepage)
Publication Date:
11/1977
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
B STARS, H ALPHA LINE, LINEAR POLARIZATION, STELLAR ENVELOPES, STELLAR SPECTRA, ABSORPTION SPECTRA, LINE SHAPE, POSITION (LOCATION), STELLAR MODELS, STELLAR ROTATION
Comment:
A&AA ID. AAA020.064.023
DOI:
10.1086/155673
Bibliographic Code:
1977ApJ...218..220P

Abstract

The reported investigation shows that the position-angle changes in the H-alpha line of gamma Cas can be explained both qualitatively and quantitatively by a rotating disklike envelope. It is concluded that the envelope surrounding gamma Cas is for the most part axisymmetric. The assumption of axial symmetry simplifies the problem of modeling the envelope a great deal. The discussed investigation demonstrates that position-angle changes in the emission lines of Be stars cannot be taken to indicate the presence of interstellar polarization alone.

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