A Comparison of the Variability of the Symbiotic X-ray Binaries, GX 1+4, 4U 1954+31, and 4U 1700+24 from Swift/BAT and RXTE/ASM Observations

Details A Comparison of the Variability of the Symbiotic X-ray Binaries, GX 1+4, 4U 1954+31, and 4U 1700+24 from Swift/BAT and RXTE/ASM Observations A Comparison of the Variability of the Symbiotic X-ray Binaries, GX 1+4, 4U 1954+31, and 4U 1700+24 from Swift/BAT and RXTE/ASM Observations

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2002c&link_type=abstract

American Astronomical Society Meeting 210, #20.02; Bulletin of the American Astronomical Society, Vol. 39, p.122

Astronomy and Astrophysics

Astronomy

Scientific paper

We present an analysis of the X-ray variability of the three known symbiotic X-ray binaries, GX 1+4, 4U 1700+24, and 4U 1954+31, using observations made with the Swift Burst Alert Telescope (BAT) and the Rossi X-ray Timing Explorer (RXTE) All-Sky Monitor (ASM). Observations of 4U 1954+31 with the Swift BAT show modulation at a period near 5 hours. Models to explain this modulation are discussed including the presence of an exceptionally slow X-ray pulsar in the system and accretion instabilities. Unlike 4U 1954+31, neither GX 1+4 nor 4U 1700+24 show any evidence for modulation on a timescale of hours. An analysis of the Rossi X-ray Timing Explorer light curves of GX 1+4, 4U 1700+24, and 4U 1954+31 does not show the presence of orbital modulation in any source although there is considerable variability on long timescales. There is no modulation in GX 1+4 on the optical 1161 day orbital period and for 4U 1700+24 we do not confirm the 404 day period previously proposed for this source from a shorter duration ASM light curve. Future extended observations of 4U 1700+24 when in outburst may have the potential to show pulsations from this source.

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