Hostname: page-component-84b7d79bbc-g78kv Total loading time: 0 Render date: 2024-07-25T14:15:05.920Z Has data issue: false hasContentIssue false
  • English
  • Français

Magnetic Fields and Winds of the Intermediate Helium Stars

Published online by Cambridge University Press:  12 April 2016

Paul K. Barker
Paul K. Barker*
Affiliation:
Astronomy DepartmentUniversity of Western OntarioLondon, Ontario N6A 3K7Canada

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The intermediate helium stars are exceedingly rare hot analogs of the classical Ap stars, and are the earliest type stars to possess observable global ordered magnetic fields. A recent discovery is the existence of stellar winds which have large scale magnetospheric structure embedded within them. The nature and geometry of the detected fields are summarized, and the modulation of the circumstellar material by the field is illustrated for two examples: the rapid rotator σ Ori E, and the slow rotator HD 184927. The complex variety of stellar wind phenomenology which may be encountered is displayed by a sample of ten helium strong stars. A few of these objects show Hα emission, and thus are the only known magnetic Be stars.

Type
VI Intermediate Helium Stars
Information
International Astronomical Union Colloquium , Volume 87: Hydrogen Deficient Stars and Related Objects , 1985 , pp. 277 - 296
Copyright
Copyright © Reidel 1986

References

Barker, P.K. 1982, in IAU Symposium 98, Be Stars, ed. Jaschek, M. and Groth, H.-G. (Dordrecht: Reidel), p.485.CrossRefGoogle Scholar
Barker, P.K., Bolton, C.T., Brown, D.N., Landstreet, J.D., and Shore, S.N. 1986, in preparation.Google Scholar
Barker, P.K., Brown, D.N., Bolton, C.T., and Landstreet, J.D. 1982, NASA CP-2238, p.589.Google Scholar
Barker, P.K., Brown, D.N., and Marlborough, J.M. 1987, in preparation.Google Scholar
Barker, P.K., Landstreet, J.D., Marlborough, J.M., and Thompson, I.B. 1985, Ap. J., 288, 741.Google Scholar
Barker, P.K., Landstreet, J.D., Marlborough, J.M., Thompson, I., and Maza, J. 1981, Ap. J., 250, 300.Google Scholar
Bolton, C.T. 1983, Workshop on Rapid Variability of Early Type Stars, Hvar Obs. Bull., 7, No. 1.Google Scholar
Bolton, C.T. 1985, private communication.Google Scholar
Bolton, C.T. 1986, private communication.Google Scholar
Borra, E.F., and Landstreet, J.D. 1979, Ap. J., 228, 809.Google Scholar
Borra, E.F., Landstreet, J.D., and Mestel, L. 1982, Ann. Rev. Astron. Astrophys., 20, 191.Google Scholar
Brown, D.N., Shore, S.N., and Sonneborn, G. 1985, A. J., 90, 1354.Google Scholar
Drake, S.A., Abbott, D.C., Bieging, J.H., Churchwell, E., and Linsky, J.L. 1984, in Radio Stars, ed. Hjellming, R. and Gibson, D. (New York: Plenum).Google Scholar
Friend, D.B., and MacGregor, K.B. 1984, Ap. J., 282, 591.Google Scholar
Groote, D., and Hunger, K. 1982, Astr. Ap., 116, 64.Google Scholar
Henrichs, H.F. 1984, ESA SP-218, p. 43.Google Scholar
Henrichs, H.F. 1986, in 0, Of, and Wolf-Rayet Stars, ed. Conti, P.S. and Underhill, A.B., in press.Google Scholar
Hunger, K. 1986, this publication.Google Scholar
Landstreet, J.D. 1980, A. J., 85, 611.CrossRefGoogle Scholar
Landstreet, J.D. 1982, Ap. J., 258, 639.CrossRefGoogle Scholar
Landstreet, J.D. 1986, private communication.Google Scholar
Landstreet, J.D., and Borra, E.F. 1978, Ap. J. (Letters), 224, L5.CrossRefGoogle Scholar
Levato, H., and Malaroda, S. 1979, Pub. A. S. P., 91, 789.CrossRefGoogle Scholar
Limber, D.N. 1974, Ap. J., 192, 429.Google Scholar
Michaud, G. 1986, this publication.Google Scholar
Nakajima, R. 1981, Science Reports of the Tohoku University, 8th Series, 2, No. 3, p. 130.Google Scholar
Nerney, S. 1980, Ap. J., 242, 723.CrossRefGoogle Scholar
Odell, A.P. 1986a, this publication.Google Scholar
Odell, A.P. 1986b, this publication.Google Scholar
Peterson, D.M., and Theys, J.C. 1981, Ap. J., 244, 947.CrossRefGoogle Scholar
Rakos, K.D. 1981, NASA CP-2171, p. 167.Google Scholar
Saito, M. 1974, Pub. Astr. Soc. Japan, 26, 103.Google Scholar
Severny, A. 1970, Ap. J. (Letters), 159, L73.CrossRefGoogle Scholar
Shore, S.N. 1978, Ph. D. Thesis, University of Toronto.Google Scholar
Shore, S.N., and Adelman, S.J. 1981, 23rd Liège Astrophys. Coll., p.429.Google Scholar
Shore, S.N., and Brown, D.N. 1986, in preparation.Google Scholar
Thompson, I.B., and Landstreet, J.D. 1985, Ap. J. (Letters), 289, L9.Google Scholar
Underhill, A.B. 1984, Ap. J., 276, 583.Google Scholar
Walborn, N.R. 1974, Ap. J. (Letters), 191, L95.Google Scholar
Walborn, N.R. 1983, Ap. J., 268, 195.CrossRefGoogle Scholar