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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

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