Quasi-periodic oscillations in the Z source GX 5-1

Details Quasi-periodic oscillations in the Z source GX 5-1 Quasi-periodic oscillations in the Z source GX 5-1

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.256..545l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 256, no. 4, June 15, 1992, p. 545-570. Research support

Astronomy and Astrophysics

Astronomy

34

Horizontal Branch Stars, Periodic Variations, Stellar Oscillations, X Ray Binaries, Color-Color Diagram, Ginga Satellite, Light Curve, Stellar Spectra, X Ray Astronomy

Scientific paper

A detailed study has been conducted of the time variability in the Z source GX 5-1 using Ginga, which observed the source in the horizontal and normal branches (HB, NB). Intensity-dependent HF, quasi-periodic oscillations (QPO) were observed in the HB, in which the source flux varied by a factor of 1.9. The QPO frequency in this portion of the HB ranges from about 13 to 17 Hz; this is lower than previously observed in any Z source. The HF and LF QPO were simultaneously observed in the NB. The strength of both forms of QPO and the strength of the LF noise increase rapidly with increasing photon energy.

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