Rotse-III Well-sampled Optical Light Curve For The 2005 Outburst Of GRO J1655-40

Details Rotse-III Well-sampled Optical Light Curve For The 2005 Outburst Of GRO J1655-40 Rotse-III Well-sampled Optical Light Curve For The 2005 Outburst Of GRO J1655-40

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2007s&link_type=abstract

American Astronomical Society Meeting 210, #20.07; Bulletin of the American Astronomical Society, Vol. 39, p.122

Astronomy and Astrophysics

Astronomy

Scientific paper

Since optical and X-ray emission from transient X-Ray Binary systems probe spacially distinct regions of the accretion disc, correlating light curves at different wavelengths yields information about the dynamics of disc evolution. However, it is difficult to construct a well-sampled optical light curve for a long-lasting outburst, due to the constraints of ground-based observing and the high demand on space observatories. The world-wide distribution of the telescopes in the third generation Robotic Optical Transient Search Experiment (ROTSE-III) affords a unique opportunity to follow a transient event. On 8 March 2005 (UT), ROTSE-IIIa (at Siding Spring Observatory, NSW, Australia) and ROTSE-IIIc (at the HESS site, Namibia) began monitoring the location of X-ray Binary GRO J1655-40, which coincidentally was beginning an outburst at that time. Over the next 200 days, these two instruments accumulated over 5000 observations (unfiltered, calibrated to USNO B1.0 R-band) of this target. We report here on the optical light curve of the 2005 outburst, in comparison to the RXTE ASM 2-12 keV light curve. We will compare the time scales for the rise and fall of the intensity, and contrast the strongest features of the curves. In particular, the optical observations show that the brightness of this system dropped from 14.6+-0.1 to 15.3+-0.3 over the span of less than 65 minutes, at a time close to the onset of the most violent activity in the X-ray light curve.

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