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Time-Resolved Photometry of GK Persei during the 1996 Outburst
GK Per is a unique cataclysmic variable star which has shown a novaexplosion as well as dwarf nova-type outbursts, and has anintermediate-polar nature. We carried out V-band time-resolvedphotometry and B-band monitoring during the 1996 outburst. This outburstlasted for about 60d, and was divided into three parts: a slow-risebranch for 35d, a gradual-decay branch with a decay rate of 20.0 dmag-1 for ˜ 16 d, and a rapid-decline branch with arate of 5.6 d mag-1 for ˜ 10 d. The B V color becamebluest (B V ˜ 0.18) at about 10d before the outburst maximum,which supports an idea that the outburst in GK Per is of the inside-outtype. The spin pulse, 440-s quasi periodic oscillations (QPOs), and˜ 5000-s QPOs were detected in our light curve, as previously seenin X-ray and optical observations. In addition, we report on thediscovery of an ˜ 300-s periodicity, which is shorter than thespin period.
| Stars with ISM Polarization Observed with HPOL
Polarization data are given for stars whose polarizations are mostlyinterstellar which were observed for various programs with theUniversity of Wisconsin spectropolarimeter (HPOL) during 1989-1994.
| High speed photometry of GK Persei during the 1986 optical outburst.
We present high speed photometric observations in the U band of the oldnova GK Per during the 1986 optical outburst. We discuss periodicitiesfound at about 40 seconds, half an hour and an hour. No coherent opticalcounterpart of the 351s X-ray pulse was detected. Occasionally, periodsslightly larger than the X-ray period have been however observed.
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