THE AM Her PERIOD SPIKE

  • J. P. Lasota
Chapter
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUH, volume 8)

Abstract

The AM Her period spike is due to the resumption of mass transfer after evolving through the period gap. This implies that (i) at the spike period all secondary stars are the same (ii) most AM Her white dwarfs have a unique mass ≃ 0.6 – O.7M⊙ (iii) nova explosions on magnetic white dwarfs remove exactly the mass accreted between outbursts (iv) the newly discovered AM Her system at 127min has a mass ≃ 1.3 – 1.4M⊙ (v) the maximum magnetic field for most AM Her’s is ≤ 4 × 107 G.

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Copyright information

© International Astronomical Union 1989

Authors and Affiliations

  • J. P. Lasota
    • 1
  1. 1.Département d’Astrophysique Relativiste et CosmologieObservatoire de Paris, Section de MeudonMeudon Principal CedexFrance

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