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- W2178441462 abstract "We study the evolution of hydrogen-rich cataclysmic variables (CVs) near minimum orbital at ~78 minutes. As has been known for many years, these are among the most intrinsically common CVs, but they hide fairly well because of their faintness and low incidence of eruptions. We discuss their number and observational signatures, paying special attention to those that may have passed minimum orbital period—the period bouncers. The status of binaries near minimum is best determined by the mass ratio, and this is best constrained by measuring the accretion disk precession frequency, because that frequency is readily accessible to observation and proportional to the secondary star's mass. This method reveals four stars that are good candidates to have survived bounce; two appear to have secondaries as puny as 0.02 M⊙. But each star can have bounced only recently if at all. There is still no strong evidence of any long era of evolution in a state of increasing period. This conflicts sharply with discussions of observational data that have identified dozens of known CVs with this state. The total space density of cataclysmic variables is ~10–5 pc–3, with short-period systems constituting ~75% of the total. Both estimates are far less than predicted by simple theories of evolution. It is probably necessary to have some means of destroying CVs before they reach the predicted very high space densities. This can be done by invoking an angular momentum loss mechanism that does not quickly subside as the mass ratio becomes very low." @default.
- W2178441462 created "2016-06-24" @default.
- W2178441462 creator A5016662920 @default.
- W2178441462 date "1998-10-01" @default.
- W2178441462 modified "2023-09-30" @default.
- W2178441462 title "Late Evolution of Cataclysmic Variables" @default.
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