Simultaneous X-ray and optical observations of rapid variability in Scorpius X-1

Details Simultaneous X-ray and optical observations of rapid variability in Scorpius X-1 Simultaneous X-ray and optical observations of rapid variability in Scorpius X-1

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.191...81i&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 191, Apr. 1980, p. 81-93. Research supported by the Centre National de

Astronomy and Astrophysics

Astronomy

22

Astronomical Photometry, Eclipsing Binary Stars, Variability, X Ray Stars, Oao 3, Sas-3, X Ray Spectra

Scientific paper

Copernicus and SAS-3 observations of Sco X-1 during very active states show strong and rapid X-ray flickering with time scales as short as 20 sec. Simultaneous optical photometry reveals similar and remarkably well correlated flickering of lower amplitude. The level of correlation decreases when the X-ray source becomes fainter, but optical and X-ray fluxes, averaged over 1 min, are usually well correlated for B magnitudes less than 12.9. Cross-correlation analysis of the data during periods of high activity shows no really significant time delay between X-ray and optical features, although the cross-correlation function peaks systematically for positive lag values (optical following X-rays). The amplitude of the X-ray flickering exhibits a strong energy-dependence consistent with the well-known intensity versus spectral-hardness relation derived from previous observations. The highly correlated optical activity is interpreted as due to reprocessing of X-ray photons in the binary system.

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