The cataclysmic variable period gap: still there

Details The cataclysmic variable period gap: still there The cataclysmic variable period gap: still there

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.298l..29k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 298, Issue 2, pp. L29-l33.

Astronomy and Astrophysics

Astronomy

26

Accretion, Accretion Discs, Binaries: Close, Stars: Evolution, Stars: Low-Mass, Novae, Cataclysmic Variables

Scientific paper

We consider a recently proposed alternative explanation of the CV period gap in terms of a revised mass-radius relation for the lower main sequence. We show that no such thermal equilibrium relation is likely to produce a true gap. Using population synthesis techniques we calculate a model population that obeys the claimed equilibrium mass-radius relation. A theoretical period histogram obtained from this population shows two prominent period spikes rather than a gap. We consider also recent arguments suggesting that the period gap itself may not be real. We argue that, far from demonstrating a weakness of the interrupted braking picture, the fact that most CV subtypes prefer one side of the gap or the other is actually an expected consequence of this model.

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