The Orbital Period of IGR J11435-6109
ATel #377; R. H.D. Corbet (NASA/GSFC and USRA) and R. Remillard (MIT)
on 5 Jan 2005; 16:43 UT
Credential Certification: Robin Corbet (corbet@gsfc.nasa.gov)
Subjects: X-ray, Binary, Neutron Star, Transient, Pulsar
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.
A sine wave fit to the ASM light curve gives parameters of:
period = 52.46 +/- 0.06 days and epoch
of maximum flux = MJD 53069.5 +/- 1.9
