Other
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002xrb..confe..46u&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
Other
Optical Monitoring, The Optical/X-Ray Connection
Scientific paper
V4641 Sgr is now widely known as a superluminal jet source which experienced a luminous outburst lasting only a few hours in 1999 September. Here we report another outburst and active phase of V4641 Sgr detected in 2002 May-July. Our optical photometric campaign through VSNET (Variable Star Network) revealed some unprecedented variations which were not observed during the 1999 outburst. The most impressive one is optical short-term fluctuations. The power spectra of the fluctuations are characterized by a power law (index=-1.7). During the most prominent "optical flash", the optical flux increased by 1.2 mag only within 30 s, in other words, the energy release rate reached over 5*10^36 erg/s. This strongly indicates the optical emission source at the innermost part of accretion flow. We suggest that, in such an inner region, the synchrotron emission from jets or magnetic flares is the most promising radiation mechanism of the optical emission. Since the discovery in 1999, V4641 Sgr has experienced some distinct states. This behavior is reminiscent of GRS 1915+105 except for the strong optical emission in V4641 Sgr. We review observational properties of these active states, and urge international campaigns with TOO observations of Chandra and XMM-Newton for coming events.
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