Quasi-periodic oscillations in the Z source GX 340 +

Details Quasi-periodic oscillations in the Z source GX 340 + Quasi-periodic oscillations in the Z source GX 340 +

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..113p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, March 1, 1991, p. 113-121. Research supported by N

Astronomy and Astrophysics

Astronomy

22

Stellar Oscillations, X Ray Astronomy, X Ray Binaries, Exosat Satellite, Horizontal Branch Stars, Power Spectra, Stellar Flares, X Ray Spectra

Scientific paper

X-ray observations of the Z source GX 340 + 0 with the Ginga Observatory have found the source in three spectral states: the flaring branch (FB), the normal branch (NB) and the horizontal branch (HB). In accordance with previous observations, quasi-periodic oscillations (QPO) with frequencies 32-50 Hz were observed in the HB and near 6 Hz in a portion of the NB. In the HB the power spectra also showed low-frequency noise (LFN). The fractional rms variation of both types of QPO and of the LFN were strongly dependent on the X-ray energy band. Rough values for all three were about 2 percent at about 3 keV and about 8 percent at about 12 keV.

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