Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-06-12
Astrophys.J. 595 (2003) 1086-1093
Astronomy and Astrophysics
Astrophysics
Accepted for publication in ApJ. 21 pages including 9 figures
Scientific paper
10.1086/377469
A search is made for periodic modulation in the X-ray flux from the low mass X-ray binary GX13+1 using Rossi X-ray Timing Explorer All Sky Monitor data collected over a period of almost seven years. From a filtered data set, which excludes measurements with exceptionally large error bars and so maximizes signal to noise, modulation is found at a period of 24.065 +/- 0.018 days. The modulation is most clearly detectable at high energies (5 - 12 keV). Spectral changes are revealed as a modulation in hardness ratio on the 24 day period and there is a phase shift between the modulation in the 5 - 12 keV energy band compared to the 1.5 - 5 keV band. The high-energy spectrum of GX13+1 is unusual in displaying both emission and absorption iron line features and it is speculated that the peculiar spectral and timing properties may be connected.
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