High-frequency oscillations from CIR X-1

Details High-frequency oscillations from CIR X-1 High-frequency oscillations from CIR X-1

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..971t&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, June 15, 1987, p. 971-978.

Astronomy and Astrophysics

Astronomy

43

Neutron Stars, Spaceborne Astronomy, Stellar Oscillations, Stellar Spectrophotometry, Variable Stars, X Ray Sources, Exosat Satellite, High Frequencies, Radiant Flux Density

Scientific paper

The author reports results from an EXOSAT observation of Cir X-1 during which strong, low-frequency (5-20 Hz) quasi-periodic oscillations (QPO) were detected. QPO were also detected at much higher frequencies (100-200 Hz). These high frequencies are consistent with rotation periods in the inner accretion disc region. High-frequency QPO lend weight to the idea that the low-frequency QPO peak is due to a beating between a pulsar and disc rotation frequencies. Coherent pulsations from the neutron star have not been observed.

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