Intermediate Polars: Fast-spinning systems
€Some
Intermediate Polars have very short spin periods, for example DQ Her: 71
sec, AE Aqr: 33 sec
€In this case the magnetic field is thought to be small, so
that the
hollowed-out part of the disk is also small and the Keplarian
velocities in the field coupling region large
€AE Aqr
is a special case: the white dwarf spin period is decreasing rapidly,
and it can be calculated that almost all of the luminosity of the system arises as a
result of the spin-down energy
€Spinning
white dwarf kicks the gas from the stream out of the system – propellor
€Much of the optical and radio emission
from the system arises in colliding shocks in the ejecta
Wynn, King & Horne (1997)