The discovery of 15-30 hertz quasi-periodic oscillations in the X-ray flux of 4U 1820-30

Details The discovery of 15-30 hertz quasi-periodic oscillations in the X-ray flux of 4U 1820-30 The discovery of 15-30 hertz quasi-periodic oscillations in the X-ray flux of 4U 1820-30

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315l..49s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 315, April 1, 1987, p. L49-L53.

Astronomy and Astrophysics

Astrophysics

45

Stellar Flares, Stellar Oscillations, X Ray Binaries

Scientific paper

The 1984 Exosat observations of the fast-timing properties of 4U 1820-30 which led to the discovery of 15-30 Hz quasi-periodic oscillations (QPOs) in the X-ray flux of 4U 1820-30 are discussed. The QPOs observed were found to vary in frequency between 15 and 30 Hz and in strength between 5 and 8 percent rms, without any clear correlation with the source intensity or spectral hardness. Substantial red noise was observed, detectable up to about 40 Hz, which did not correlate with the QPO strength. The observed behavioral features of the QPOs in the 4U 1820-30 X-ray flux are discussed in the frameworks of several QPO models.

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