Abstract
THE central stars of planetary nebulae may be the ancestors of some of the white dwarfs1–3, and the magnetic white dwarfs in particular may have originated in this way4,5. There seem to be no mechanisms in the white dwarfs themselves capable of producing fields of the strengths observed, and the magnetic field must therefore be a fossil remnant of an earlier phase of evolution. The hypothesis that a high internal field is exposed by the ejection of the nebular shell has an appealing simplicity.
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VAN HORN, H., HANSEN, C. Shell flashes in planetary nuclei. Nature 249, 429–431 (1974). https://doi.org/10.1038/249429a0
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DOI: https://doi.org/10.1038/249429a0
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