The CV period gap: still there

Details The CV period gap: still there The CV period gap: still there

1998-05-31

arxiv.org/abs/astro-ph/9806007v1

Astronomy and Astrophysics

Astrophysics

5 pages, incl. 4 figures. Accepted for publication in MNRAS

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 it.

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