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[6.01] Extensive Optical Studies of the Black Hole Binary XTE J1118+480

J.B. Fitzgerald, J.A. Orosz (San Diego State University Astronomy Department)

We present multicolor light curves of the black hole binary XTE J1118+480 obtained from the Mount Laguna Observatory during much of the 2003 observing season. This X-ray transient is unusual in that it has a high galactic latitude of b = 62 degrees and is on a halo-like orbit. This object is also known to exhibit unusual variability on periods longer than the orbital period, and we use our light curves to investigate the nature of this modulation. In addition, we present refined values for the system parameters based on a complete analysis of our light curves compiled from the literature.

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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.