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On the Spectrum of Feige 7

  • D.T. Wickramasinghe (a1) and Brian Martin (a2)

Abstract

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.

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Copyright

References

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

On the Spectrum of Feige 7

  • D.T. Wickramasinghe (a1) and Brian Martin (a2)

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