BZ Cam is the first cataclysmic variable star with an accretion disk wind evident in its optical spectrum .
The wind was found by Thorstensen , who discovered intermittent P Cygni profiles occurring simultaneously in He I \lambda 5876 Å and H \alpha . We have since obtained spectra with 0.4-Å pixel ^ { -1 } dispersion and 60-s time resolution .

We find a wind much faster and more rapidly variable than the radiatively accelerated winds of OB stars , Wolf-Rayet stars , or luminous blue variables .
Instead of showing blob ejection , the whole wind of BZ Cam appears to turn on and off .
We use this to measure the acceleration law of a CV wind for the first time .
The velocity increases linearly with time , attaining blue edge velocities near -3000 { km s ^ { -1 } } , and absorption velocities near -1700 { km s ^ { -1 } } , in 6 to 8 min after starting near rest .
We also find a subsequent linear deceleration to nearly rest in 30 to 40 min , perhaps an effect of dilution as the wind expands .
No periodicity from rotational outflow is obvious .

This wind is erratic and incessantly variable , and perhaps bipolar and face-on , but not highly collimated .
The P Cygni absorption events trace out sawtooth waves , occurring within 30 to 40 white dwarf radii from the disk .
This is the approximate size of the disk , as well as the disk/wind transition region recently postulated by Knigge and Drew .
We estimate a distance of 830 \pm 160 pc , and an orbital inclination i such that 12 ^ { \circ } \mathrel { \hbox { \hbox to 0.0 pt { \hbox { \lower 4.0 pt \hbox { $ \sim$ } } } \hbox% { $ < $ } } } i < 40 ^ { \circ } .