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Modelling of UV resonance lines

Published online by Cambridge University Press:  14 August 2015

Henny J.G.L.M. Lamers  and
John C. Castor
Henny J.G.L.M. Lamers
Affiliation:
The Astronomical Institute at Utrecht Space Research Laboratory
John C. Castor
Affiliation:
Joint Institute for Laboratory Astrophysics National Bureau of Standards and University of Colorado

Abstract

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The envelopes of early type stars can be studied by comparing observed and theoretical P Cygni profiles of UV resonance lines. The lines are formed by scattering in the expanding envelope and complete frequency redistribution is a reasonable assumption. The Sobolev approximation can be used for the prediction of the profiles, except within a Doppler shift of 2xvthermal from the line center. The profiles are sensitive to the optical depth τrad(v) ∝L ni(r) (dr/dv), but insensitive to the velocity law. We present a fairly simple method to calculate the effects of a photospheric profile or partly overlapping doublets.

Type
Session 2: U.V. Spectroscopy
Information
Symposium - International Astronomical Union , Volume 83: Mass Loss and Evolution of O-Type Stars , 1979 , pp. 81 - 92
Copyright
Copyright © Reidel 1979 

References

Abbott, D.C. 1977, , .Google Scholar
Abbott, D.C. 1978, Ap. J., in press.Google Scholar
Barlow, M. and Cohen, M. 1977, Ap. J., 213, p. 737.Google Scholar
Cassinelli, J. and Rumpl, W. 1978, in preparation.Google Scholar
Castor, J.I. 1970, M.N.R.A.S., 149, p. 111.CrossRefGoogle Scholar
Castor, J.I., Abbott, D.C., and Klein, R.I. 1975, Ap. J., 195, p. 157.Google Scholar
Ebbets, D.C. 1977, , .Google Scholar
Lamers, H.J.G.L.M. and Morton, D.C. 1976, Ap. J. Suppl. 32, p. 715.Google Scholar
Lucy, L.B. 1971, Ap. J., 163, p. 95.Google Scholar
Magnan, C. 1970, J.Q.S.R.T., 10, p. 1.Google Scholar
Mihalas, D., Kunasz, P.B. and Hummer, D.G. 1976, Ap. J., 210, p. 419.Google Scholar
Noerdlinger, P.D. and Rybicki, G.B. 1974, Ap. J., 193, p 651.Google Scholar
Snow, T.P. and Jenkins, E.B. 1977, Ap. J. Suppl., 33, p. 269.Google Scholar
Snow, T.P. and Morton, D.C. 1976, Ap. J. Suppl, 32, p. 429.Google Scholar
Van Regemorter, H. 1962, Ap. J., 136, p. 906.Google Scholar