Hostname: page-component-586b7cd67f-2plfb Total loading time: 0 Render date: 2024-11-29T17:14:11.558Z Has data issue: false hasContentIssue false
  • English
  • Français

The corona plus cool wind model for of stars and OB supergiants

Published online by Cambridge University Press:  14 August 2015

Joseph P. Cassinelli
Joseph P. Cassinelli*
Affiliation:
Washburn Observatory University of Wisconsin - Madison Madison, Wisconsin 53706

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 anomalously strong OVI and NV lines in O stars and the CIV and Si IV lines in B supergiants may be due to Auger ionization by x-rays from a thin coronal zone at the base of their cool stellar winds. This paper summarizes the results of several studies to determine constraints on the size and temperature of coronal zones from calculations of the effects of coronae on continuum and line spectra. The model that has resulted can be tested by observations from HEAO-B of the predicted 2 kev emergent fluxes. The model explains very well the persistence of the OVI and NV in the ultraviolet spectra of supergiants to class B0.5 and B2 respectively, and it predicts that CIV should be observable in the ultraviolet spectra at and beyond B5I.

Type
Session 4: Panel Discussion on Stellar Wind Theories
Information
Symposium - International Astronomical Union , Volume 83: Mass Loss and Evolution of O-Type Stars , 1979 , pp. 201 - 213
Copyright
Copyright © Reidel 1979 

References

Barlow, M.J., and Cohen, M.: 1977, Ap.J. 213, p. 737.CrossRefGoogle Scholar
Cassinelli, J.P., Castor, J.I., and Lamers, H.J.G.L.M.: 1978, Publ. Ast. Soc. Pac., October 1.Google Scholar
Cassinelli, J.P., and Hartmann, L.: 1977, Ap.J. 212, p. 488.CrossRefGoogle Scholar
Cassinelli, J.P., Olson, G.L., and Stalio, R.: 1978, Ap.J. 220, p. 573.CrossRefGoogle Scholar
Cox, D.P., and Tucker, W.: 1969, Ap.J. 157, p. 1157.Google Scholar
Daltabuit, E., and Cox, D.E.: 1972, Ap.J. 177, p. 855.Google Scholar
Hearn, A.G.: 1975, Astr. & Ap. 40, p. 277.Google Scholar
Lamers, H.J.G.L.M., and Morton, D.C.: 1976, Ap. J. Supp. 32, p. 715.CrossRefGoogle Scholar
Lamers, H.J.G.L.M., and Snow, T.P.: 1978, Ap.J. 219, p. 504.Google Scholar
Morton, D.C., and Wright, A.E.: 1978, Mon. Not. Roy. Ast. Soc. 182, p. 47P.Google Scholar
Olson, G.L.: 1978, to appear in Ap.J., November 1.Google Scholar
Parsons, S.B., Wrays, J.D., Henize, K.G., and Benedict, G.F.: 1978, preprint.Google Scholar
Snow, T.P., and Morton, D.C.: 1976, Ap. J. Supp. 32, p. 429.Google Scholar
Weisheit, J.C.: 1974, Ap. J. 190, p. 735.CrossRefGoogle Scholar