DISK-OVERFLOW ACCRETION IN GK PERSEI

We reanalyze the 1983 EXOSAT observations of GK Per during an outburst to investigate the approximately 5000 s quasiperiodic modulation. We find that the spectral behavior is reminiscent of dipping low-mass X-r ay binaries and note that the time scale is characteristic of the radi us where an accretion stream overflowing the disk would collide back o nto the disk. We suggest that structure caused by such disk-overflow a ccretion was periodically obscuring the white dwarf, producing the mod ulation.