Computer Science
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002xrb..confe...1b&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
Computer Science
Optical Monitoring, The Optical/X-Ray Connection
Scientific paper
I will review the expectations for optical/IR lightcurves from the outbursts of soft X-ray transients that arise from theory and previous observation. I then compare these expectations with recent data from the YALO project, which has provided daily OIR observations for a number of sources in outburst. I conclude that a) whenever data are available, the OIR outburst precedes the start of the X-ray outburst by about a week - OIR monitoring thus provides an excellent trigger for X-ray outbursts; 2) there are a wide variety of OIR outburst morphologies, many of which have no correlation with the X-ray flux - thus it appears that effects beyond simple disk instabilities and X-ray irradiation must be invoked to explain the OIR flux; c) a new kind of outburst, dominated by IR flux, with no apparent X-ray response in the RXTE/ASM, has been observed in two sources - in both cases these IR-dominated events have significant radio flux, and thus may be related to jet activity. If so, the IR could be used as a trigger for radio observations. Finally, I will present our plans for more such monitoring over the next few years.
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