The Orbital Period of IGR J11435-6109

Astronomy and Astrophysics – Astronomy

Scientific paper

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X-Ray, Binaries, Neutron Stars, Pulsars, Transients

Scientific paper

The power spectrum of the Rossi X-ray Timing Explorer All Sky Monitor light curve of IGR J11435-6109 (ATEL #350, #358, #359, #362) obtained between 1996 January 5 and 2004 December 30 shows significant modulation at a period of 52.5 days. This confirms the orbital period proposed by in 't Zand & Heise (2004, ATEL #362). The mean flux measured with the ASM during this interval is 0.19 +/- 0.01 counts/s (2 - 12 keV), equivalent to 2.7 mCrab, and the Fourier amplitude of the modulation is 0.09 +/- 0.01 counts/s.

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