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The Detection of Ionized Helium and Carbon in the Pulsating DB Degenerate GD358

Published online by Cambridge University Press:  12 April 2016

Edward M. Sion ,
James Liebert ,
Gerard Vauclair  and
Gary Wegner
Edward M. Sion
Affiliation:
Department of Astronomy and Astrophysics,Villanova University
James Liebert
Affiliation:
Steward Observatory,University of Arizona
Gerard Vauclair
Affiliation:
Observatoire de Toulouse,France
Gary Wegner
Affiliation:
Department of Physics and Astronomy,Dartmouth College

Extract

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Spectroscopic observations of hot white dwarfs utilizing the Explorer (IUE) high resolution spectrograph have led to the important discovery of ion absorption features (undetectable at low resolution) which have been ascribed to wind outflow in some cases (cf. Bruhweiler and Kondo 1983) and formation at the photosphere (cf. Sion and Guinan 1983; Bruhweiler and Kondo 1983; Dupree and Raymond 1982) in others. These line features, often weak and sharp, have presented a fundamental challenge to current understanding of the complex interplay of physical processes which control observed surface abundances in white dwarfs: gravitational/thermal diffusion, selective radiative support of ions, mass loss, convective dilution and mixing, and accretion (cf. the review by Vauclair, this volume and references therein).

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 114: White Dwarfs , 1989 , pp. 354 - 358
Copyright
Copyright © Springer-Verlag 1989

References

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