Computer Science
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988stin...8918287h&link_type=abstract
Unknown
Computer Science
Stellar Oscillations, Stellar Spectra, X Ray Binaries, X Ray Spectra, Accretion Disks, Exosat Satellite, Stellar Evolution, X Ray Spectroscopy
Scientific paper
Although Sco X-1 normally shows two spectral/quasi-periodic oscillation (QPO) modes, during an EXOSAT observation 1986 March 12, is entered a third mode, in which the spectral hardness remained constant, the intensity decreased, and the power spectrum showed a broad noise component at 2 Hz. This mode is similar to the horizontal branch displayed by Cyg X-2, and suggests that the galactic bulge sources follow a common, Z-shaped spectral pattern. Transitions at the vertices of this pattern may represent the onset of disk instabilities, the transition from a thick to a thin disk, or transition through the Eddington limit. In all branches, Sco X-1 shows a noise continuum which cuts off at 60 Hz. No coherent pulsations are observed during this observation, with an upper limit of 0.3 pct for the frequency range 1 to 200 Hz; 0.5 pct from 200 to 1000 Hz; and 0.7 pct from 1000 to 200 Hz.
Hasinger Guenther
Middleditch John
Priedhorsky William C.
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