Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.4604v&link_type=abstract
American Astronomical Society, HEAD meeting #7, #46.04; Bulletin of the American Astronomical Society, Vol. 35, p.657
Other
Scientific paper
We studied the correlated X-ray spectral and timing behaviour of the atoll sources 4U 0614+09 and 4U 1728-34 and demonstrate that the frequencies of the variability components of these two sources follow a universal scheme of correlations relatively independent of source luminosity. Most frequencies, from 0.1 to 1200 Hz, vary in a strongly correlated fashion, but one is nearly constant near 150 Hz. The transient source 4U 1608-52, previously classified as an atoll source but recently reported to trace a Z track in the color diagram, is found by us to exactly conform to this same universal atoll frequency correlation scheme, suggesting a very similar accretion flow configuration. A similar study of the millisecond X-ray pulsar SAX J1808.4-3658 is currently in progress, which indicates that some discrepancies occur in that source, perhaps related to a stronger magnetic field or a different spin in the pulsar as compared to the other atoll sources.
van der Klis Michael
van Straaten S.
Wijnands Rudy
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