Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..197m&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 197-202 (SEE N90-25711 19-89)
Astronomy and Astrophysics
Astronomy
5
Ginga Satellite, Japanese Space Program, Satellite Observation, Stellar Oscillations, X Ray Binaries, Black Body Radiation, Periodic Variations, Power Spectra, Stellar Models, Stellar Spectra
Scientific paper
The Ginga results for the horizontal branch Quasi-Periodic Oscillation (QPO) (23 to 40 Hz) from GX 5-1 and 6 Hz QPO from 6 low-mass binary X-ray sources are presented. The power spectra of GX 5-1 in the horizontal branch were analyzed with model functions based on the oscillating shot models. To fit the observed power spectra with these models two different life times in the shots are assumed. The powers of the low frequency noise and the QPO were found to show temporal variations on time scales of 256 seconds. These variations are correlated with each other on time scales longer than a fews tens of seconds. The energy dependency of the 6 Hz QPO amplitude is presented. For the normal branch QPO from Z-sources and the broad peak features in the power spectra of two atoll sources, the difference between the spectra at the top and at the bottom of the oscillations is found to have the appearance of a roughly 2.2 keV blackbody spectrum.
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