Physics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002xrb..confe..24m&link_type=abstract
X-ray Binaries in the Chandra and XMM-Newton Era (with an emphasis on Targets of Opportunity), Abstracts of the conference held
Physics
Super-Soft Sources, Dwarf Novae
Scientific paper
We present an analysis of simultaneous RXTE/ASM and optical AAVSO observations of SS Cygni over a ~5 yr period. By summing the X-ray flux over multiple outbursts, phased using the optical light curve, we find that the hard (3-12.2 keV) X-rays are suppressed during outburst. This confirms the trend seen in the few outbursts previously observed. The several outbursts of SS Cygni observed with the more sensitive RXTE/PCA also show depression of the hard X-rays during optical outburst. We quantify the time lags between the optical and X-ray outbursts, and the time scales of the hard X-ray spectral recovery from outburst. The optical light curve of SS Cygni exhibits anomalous or "mini" outbursts. During these events, the hard X-ray and optical flux increase is correlated. We also investigated the optical and X-ray evolution of SS Cygni during quiescence using the RXTE/ASM and AAVSO data. Our results suggest that the hard X-ray flux declines between one outburst and the next. We discuss our observational results in the framework of the theoretical models of the accretion flow in dwarf novae systems.
McGowan Katherine
Priedhorsky William
Trudolyubov Sergey
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