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Simultaneous Spectroscopy and Polarimetry of Be Stars

Published online by Cambridge University Press:  23 September 2016

D. R. Gies  and
David McDavid
D. R. Gies
Affiliation:
McDonald Observatory, The University of Texas at Austin
David McDavid
Affiliation:
Division of Earth and Physical Sciences, The University of Texas at San Antonio

Extract

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Evidence is now accumulating that many Be stars display photospheric line profile variations on timescales of days or less that are probably caused by nonradial pulsations (Baade 1984; Penrod 1986). In some circumstances these pulsations can promote mass loss into the circumstellar envelope, and consequently the conditions in the inner part of the envelope may vary on similar timescales. Changes in the envelope could produce variations in the polarization and emission line profiles, and observers have reported rapid variability in both. We describe here an initial attempt to search for simultaneous variations in continuum polarization, Hα emission, and the He I λ6678 photospheric absorption line in order to investigate correlated changes on short timescales.

Type
IIA. The Underlying Stars: Observations
Information
International Astronomical Union Colloquium , Volume 92: Physics of Be Stars , August 1987 , pp. 84 - 86
Copyright
Copyright © Cambridge University Press 1987

References

Baade, D. (1984). There are more absorption line profile-variable Be stars with short periods. Astr. Astrophys., 134, 105-17.Google Scholar
Hayes, D. P. and Guinan, E. F. (1984). The morphology of a mass loss episode of the Be star ω Ori. Astrophys. J., 279, 721-8.Google Scholar
McLean, I. S. (1979). Interpretation of the intrinsic polarizations of early-type emission-line stars. Mon. Not. R. Astr. Soc., 186, 265-85.Google Scholar
Penrod, G. D. (1986). Episodic mass motions and surface phenomenon. Pub. Astr. Soc. Pac., 98, 35-6.CrossRefGoogle Scholar
Poeckert, R. (1981). A spectroscopic study of the binary Be star ϕ Persei. Pub. Astr. Soc. Pac., 93, 297–317.Google Scholar
Poeckert, R., Bastien, P. and Landstreet, J. D. (1979). Intrinsic polarization of Be stars. Astr. J., 84, 812-30.Google Scholar