Physics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.313..768v&link_type=abstract
Nature (ISSN 0028-0836), vol. 313, Feb. 28, 1985, p. 768-771. Sponsorship: Nederlandse Organisatie voor Zuiver-Wetenschappelijk
Physics
31
Binary Stars, Stellar Oscillations, X Ray Sources, Accretion Disks, Cygnus Constellation, Exosat Satellite, Light Curve, Pulsars, Radio Bursts, Stellar Occultation
Scientific paper
X-ray data on Cyg X-3 obtained with Exosat and showing transient quasi-periodic oscillations with amplitudes between 5 and 20 percent of the 1-10 keV flux and periods in the range 50-1500 s are described. The oscillations persisted typically for 5-40 (quasi-oscillation) cycles, occurred exclusively in the phase interval 0.0-0.75 (rising branch and top of the X-ray light curve), were seen during the high state and probably also during the low state of the source and, at least once, were observed with two different periods simultaneously. It is suggested that the quasi-periodic flux variations are caused by quasi-periodic phenomena in an accretion disk which partially occult the X-ray source. This tentative interpretation is in accordance with the idea that the 4.8 hr modulation of the X-ray flux in Cyg X-3 arises by partial occultations of the X-ray source by an accretion disk, as in low-mass X-ray binaries like 4U1822 - 37.
Jansen Fred A.
van der Klis Michael
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