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On the Spectrum of Feige 7

Published online by Cambridge University Press:  12 April 2016

D.T. Wickramasinghe  and
Brian Martin
D.T. Wickramasinghe
Affiliation:
Royal Observatory, Edinburgh, U.K.
Brian Martin
Affiliation:
Department of Applied Mathematics, School of General Studies, Australian National University, Canberra, Australia

Abstract

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The Zeeman theory of hydrogen and neutral helium lines is used to analyse the spectrum of the magnetic DBA white dwarf Feige 7. On the assumption of a centered dipole field distribution and a uniform chemical composition, the atmospheric helium to hydrogen ratio by number, , is found to be ~ 102. However, it is argued that either one, or both of these assumptions are likely to be in error.

Type
Colloquium Session V
Information
International Astronomical Union Colloquium , Volume 53: White Dwarfs and Variable Degenerate Stars , August 1979 , pp. 317 - 321
Copyright
Copyright © The University of Rochester 1979

References

Greenstein, J. 1976, A.J., 81, 823.CrossRefGoogle Scholar
Griem, H. 1974, Line Broadening by Plasmas (Academic Press).Google Scholar
Kemic, S.B. 1974, Joint Inst. Laboratory Astrophysics Rep. 113.Google Scholar
Liebert, J., Angel, J.R.P., Stockman, H.S., Spinrad, H. and Beaver, E.A. 1977, Ap.J., 214, 457.CrossRefGoogle Scholar
Martin, B. and Wickramasinghe, D.T. 1978, M.N.R.A.S., 183, 533.CrossRefGoogle Scholar
Wickramasinghe, D.T. 1979 (This conference).Google Scholar
Wickramasinghe, D.T. and Martin, B. 1979, M.N.R.A.S., (in press).Google Scholar