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The AM Her Period Spike

Published online by Cambridge University Press:  14 August 2015

J.P. Lasota
J.P. Lasota*
Affiliation:
Département d’Astrophysique Relativiste et Cosmologie, Observatoire de Paris, Section de Meudon, 92195 Meudon Principal Cedex, France

Abstract

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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 — 0.7M⊙ (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 x 107 G.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 8: Highlights of Astronomy. As presented at the XXth General Assembly of the IAU, 1988 , 1989 , pp. 173 - 174
Copyright
Copyright © Kluwer 1989

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