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"Stellar magnetism"

International Conference Proceedings,

1992 ,

173-180 .

OBSERVATION S O F TH E RAPI D QUASI-PERIODI C OSCILLATION S I N A M HERCULI S

V.P .

KOZHEVNIKO V

Astronomica l Observatory , Ura l Stat e University , Ekaterinbur g 620083 , Russi a

ABSTRACT .

High-speed photometry of AM Her with a

time resolution of 0.3 s ranging from

display presence of quasi-periodic oscillations with periods 4s to 120 s and a coherence time of 5-20 minutes.

Pulse profiles of the a wider miwere ana-

oscillations with the 4-18 s periods show the typical feature: nimum as lyzed. compared with maximum. the Over number two hundred of power

spectra

The distribution of on

oscillation that

occurrences the

observed

as dependent

the frequency makes us suggest

oscillations ob-

served in AM Her may be similar to 1-3 s oscillations in some other polars. In contradistinction to other polars, at lower frequencies (approximately the oscillations in AM Her take place thirty times). Significant their values of

oscillation periods a model of

(tens of seconds) make us choose for flux tube oscillations rather than

explanation shock

magnetic

oscillating

model.

173