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Wolf-Rayet star variability and wind inhomogeneities

  • John C. Brown (a1) and Lorna L. Richardson (a1)

Abstract

The wind structure diagnostic possibilities offered by combined study of photo-, spectro-, and polari-metric variability are discussed using data from the Montreal group. These demand the presence in the wind of localised density inhomogeneities and in particular of large ‘blobs’ denser than the ‘mean’ wind and put bounds on the size, mass, and density of individual blobs and their distributions, with implications for theories of blob formation. Blobs responsible for polarimetric variability must be present at the stellar surface rather than forming in the wind, and the relation of this to spectrometric indications that blobs are only detectable at several stellar radii is discussed.

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Copyright

References

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Brown, J.C., McLean, I.S. 1977, A&A 57, 141
Brown, J.C., McLean, I.S., Emslie, A.G. 1978, A&A 68 415
Brown, J.C., Carlaw, V.A., Cassinelli, J.P. 1989, ApJ 344, 341
Brown, J.C., Wood, K.H. 1991, A&A 265, 663
Brown, J.C., Richardson, L.L., Antohkin, I., Robert, C., Moffat, A.J.F., St-Louis, N. 1994, A&A submitted
Cassinelli, J.P., Nordsieck, K.H., Murison, M.A. 1987, ApJ 317, 290
Moffat, A.J.F., Robert, C. 1991, in: van der Hucht, K.A. & Hidayat, B. (eds.), Wolf-Rayet Stars and Interrelations with other Massive Stars in Galaxies, Proc. IAU Symp. No. 143 , (Dordrecht: Kluwer), p. 109
Owocki, S.P. 1994, in: Moffat, A.F.J. & St-Louis, N. (eds.), Variability and Instability in Hot Star Winds, in press
Richardson, L.L., Brown, J.C. 1994a, these proceedings
Richardson, L.L., Brown, J.C. 1994b, in preparation
Robert, C. 1992, PhD thesis, University of Montreal
Wood, K.H., Brown, J.C., Fox, G.K. 1993, A&A 271, 492

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Wolf-Rayet star variability and wind inhomogeneities

  • John C. Brown (a1) and Lorna L. Richardson (a1)

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