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Polarization Measurements Across the Balmer Lines of Be and Shell Stars

Published online by Cambridge University Press:  14 August 2015

I. S. McLean  and
D. Clarke
I. S. McLean
Affiliation:
Department of Astronomy, University of Glasgow, Scotland, United Kingdom
D. Clarke
Affiliation:
Department of Astronomy, University of Glasgow, Scotland, United Kingdom

Abstract

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We have made linear polarization measurements of several Be and shell stars across the Hα and Hβ lines, all of the stars exhibiting polarization in the continuum, the emphasis here being on measurements made of ζ Tau, 48 Per, φ Per, and γ Cas. Three types of results ensue: some stars show no significant change of polarization across the Balmer features (e.g., 48 Per, X Per); some stars show a reduced polarization across the features (e.g., γ Cas, ζ Tau) indicating the presence of intrinsic polarization; some stars show a change in the degree of polarization but with a marked rotation of the direction of vibration (e.g., φ Per, 48 Lib) which can be attributed to a combination of non-aligned intrinsic (circumstellar) and interstellar polarizations. Interpretations of these results are discussed, and we demonstrate the potential power of line profile polarimetry/photometry as an important new method for separating intrinsic and interstellar polarization effects, thus enabling polarization observations to be used as a constraint on models of Be stars.

Type
Part III: New Observational Techniques
Information
Symposium - International Astronomical Union , Volume 70: Be and Shell Stars , 1976 , pp. 261 - 275
Copyright
Copyright © Reidel 1976 

References

Bernacca, P. L. and Perinotto, M.: 1971, Contr. D'Osservat. Astr. D'Univ. DiPadova in Asiago , No. 249.Google Scholar
Blanco, V. M., Demers, S., Douglass, G. G., and Fitzgerald, M. P.: 1968, Photoelectric Catalogue , Publ. U. S. Naval Obs.Google Scholar
Capps, R. W., Coyne, G. V., and Dyck, H. M.: 1973, Astrophys. J. 184, 173.Google Scholar
Cassinelli, J. P. and Haisch, B. M.: 1974, Astrophys. J. 188, 101.Google Scholar
Clarke, D. and McLean, I. S.: 1974a, in Gehrels, T. (ed.), Planets, Stars and Nebulae Studied with Photopolarimetry , IAU Colloquium No. 23 (1972), Univ. of Arizona Press, Tuscon, p. 752.Google Scholar
Clarke, D. and McLean, I. S.: 1974b, Monthly Notices Roy. Astron. Soc. 167, 27P.Google Scholar
Clarke, D. and McLean, I. S.: 1975a, Monthly Notices Roy. Astron. Soc. 172, 545.Google Scholar
Clarke, D. and McLean, I. S.: 1975b, Monthly Notices Roy. Astron. Soc. (1976) 174, 335.Google Scholar
Clarke, D. and McLean, I. S.: 1975c, Monthly Notices Roy. Astron. Soc. 173, 21P.CrossRefGoogle Scholar
Clarke, D., McLean, I. S., and Wyllie, T. H. A.: 1975, Astron, Astrophys. 43, 215.Google Scholar
Coyne, G. V.: 1974, Monthly Notices Roy. Astron. Soc. 169, 7P.Google Scholar
Coyne, G. V. and Kruszewski, A.: 1969, Astron. J. 74, 528.CrossRefGoogle Scholar
Coyne, G. V. and McLean, I. S.: 1975, Astron. J. 80, 702.Google Scholar
Hall, J. S.: 1958, Publ. U.S. Naval Obs. 17, Pt. VI.Google Scholar
Hayes, D. P.: 1975, Publ. Astron. Soc. Pacific 87, 609.Google Scholar
Hayes, D. P. and Illing, R. M. E.: 1974, Astron. J. 79, 1430.Google Scholar
Hiltner, W. A.: 1956, Astrophys. J. Suppl. 2, 389, No. 24.Google Scholar
Hoffleit, D.: 1964, Catalogue of Bright Stars , Yale Univ. Obs., New Haven, Conn.Google Scholar
Johnson, H. L.: 1958, Lowell Obs. Bull. No. 90, 37.Google Scholar
Marlborough, J. M.: 1969, Astrophys. J. 156, 135.Google Scholar
Marlborough, J. M. and Cowley, A. P.: 1974, Astrophys. J. 187, 99.Google Scholar
Poeckert, R.: 1975, Astrophys. J. 196, 777.Google Scholar
Serkowski, K.: 1968, Astrophys. J. 154, 115.Google Scholar
Serkowski, K.: 1973, in Greenberg, J. M. and van de Hulst, H. C. (eds.), ‘Interstellar Dust and Related Topics’, IAU Symp. 52, 145.Google Scholar
Zellner, B. H. and Serkowski, K.: 1972, Publ. Astron. Soc. Pacific 84, 619.Google Scholar