Hostname: page-component-745bb68f8f-f46jp Total loading time: 0 Render date: 2025-01-13T00:26:37.414Z Has data issue: false hasContentIssue false
  • English
  • Français

On the Properties of Wolf-Rayet Stars and Their Mass Loss

Published online by Cambridge University Press:  14 August 2015

N. Panagia  and
M. Felli
N. Panagia
Affiliation:
Istituto di Radioastronomia CNR, Bologna, Italy
M. Felli
Affiliation:
Osservatorio Astrofisico di Arcetri, Firenze, Italy

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.

From consideration of the observed properties of the envelopes produced by mass loss in WR stars we find that:

  1. a) The velocity at the optical photosphere is in the range 200–800 km s

  2. b) The effective photospheric radius for the continuous radiation capable to ionize helium twice (γ < 228 A) is typically 5 to 15 times the optical photospheric radius.

  3. c) The radiation temperature in the Lyman continuum (γ < 912 Å) is around 5 × 104K. Therefore, most of the stellar radiation is emitted in the far UV and the total luminosity is considerably higher than currently estimated.

  4. d) Multiple scattering (N ≃ 20) of radiation in the interval 228–504 Å can provide most of the momentum needed to accelerate the wind up to the observed terminal velocities.

Type
SESSION 3 — MASS-LOSS FROM WR STARS: OBSERVATIONS AND THEORY
Information
Symposium - International Astronomical Union , Volume 99: Wolf-Rayet Stars: Observations, Physics, Evolution , 1982 , pp. 203 - 207
Copyright
Copyright © Reidel 1982 

References

Abbott, D.C., Bieging, J.H., and Churchwell, E.: 1982, this Symposium.Google Scholar
Barlow, M.J., Smith, L.J., and Willis, A.J.: 1981, Monthly Notices Roy. Astron. Soc. 196, pp. 101–110.Google Scholar
Felli, M., and Panagia, N.: 1981, in preparation.Google Scholar
Klein, R.I., and Castor, J.I.: 1978, Astrophys. J. 220, pp. 902–923.Google Scholar
Morton, D.C.: 1979, I.A.U. Symposium No. 49, D. Reidel Publ. Co., Dordrecht, p. 54.Google Scholar
Panagia, N., and Macchetto, F.: 1981, in “Effects of Mass Loss on Stellar Evolution”, Chiosi, C. and Stalio, R. (eds.) D. Reidel, Publ. Co., Dordrecht, pp. 173–178.CrossRefGoogle Scholar
Panagia, N., and Macchetto, F.: 1982, Astron. Astrophys., in press.Google Scholar
Panagia, N., Tanzi, E.G., Tarenghi, M.: 1982, this Symposium.Google Scholar
Willis, A.J.: 1980, Proc. Second European IUE Conference, ESA-SP 157, p. IL–LVII.Google Scholar