Cataclysmic-variable orbital-period distribution
= Cataclysmic-variable orbital-period distribution
{title2=$N(P)$}
Ordinary hydrogen-rich <cataclysmic variables> occur on both sides of a <cataclysmic-variable period gap> at approximately two to three hours, with a <cataclysmic-variable period minimum> near 82 minutes. Selection effects change the observed proportions. https://arxiv.org/abs/1102.2440[Knigge, Baraffe and Patterson's donor-based evolutionary study] summarizes these empirical landmarks.