Discovery of 5 HZ quasi-periodic oscillations in Cygnus X-2

Details Discovery of 5 HZ quasi-periodic oscillations in Cygnus X-2 Discovery of 5 HZ quasi-periodic oscillations in Cygnus X-2

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312..732n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 15, 1987, p. 732-738. Navy-supported research.

Astronomy and Astrophysics

Astrophysics

24

Pulsars, Stellar Oscillations, Stellar Spectra, X Ray Binaries, Heao 1, Periodic Variations, Power Spectra

Scientific paper

An 8 hr HEAO A-1 observation of 5 Hz quasi-periodic oscillations (QPOs) in Cyg X-2 is reported. The observed QPO frequency variations are erratic and uncorrelated with intensity, and the average deviation from the mean frequency is four percent, much less than the variation observed in Cyg X-2 by Hasinger et al. (1986). The data are inconsistent with an extrapolation of the intensity-QPO frequency curve for Cyg X-2 by Hasinger et al., assuming the beat frequency model of Lamb et al. (1985). This model also predicts a positive correlation between QPO and low-frequency noise/red noise strength; however, the authors here find no relationship between these parameters. It is concluded that the QPOs observed here are a mode distinct from those seen earlier and call for a different model.

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