Optical Variability in XTE J1118+480

Astronomy and Astrophysics – Astronomy

Scientific paper

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Optical, Binaries, Black Holes, Transients

Scientific paper

High time-resolution (1-sec) white light photometry of the outbursting black hole XTE J1118+480 (ATEL #383, #384, #385, #386, #387) was obtained with the Argos CCD photometer on the McDonald Observatory 2.1m telescope on 2005 January 13.35. Significant optical variability was detected on timescales shorter than 100s, with an rms amplitude of 3% integrated from 0.01-0.5Hz. As in the previous outburst, the power spectral density takes the form of band-limited noise, but with a higher break frequency at 0.12Hz.

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