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Peculiar spectral and power spectral behaviour of the LMXB GX 13+1 by Schnerr, R. S.; Reerink, T.; van der Klis, M.; Homan, J.; Méndez, M.; Fender, R. P.; Kuulkers, E. is a scholarly article available to read on EtoBox.

What is Peculiar spectral and power spectral behaviour of the LMXB GX 13+1 about?

We present results of an analysis of all 480 ks of Rossi X-ray Timing Explorer Proportional Counter Array data obtained from 17 May 1998 to 11 October 1998 on the luminous low mass X-ray binary GX 13+1. We analysed the spectral properties in colour-colour diagrams (CDs) and hardness-intensity diagrams (HIDs) and fitted the power spectra with a multi-Lorentzian model. GX 13+1 traces out a curved track in the CDs on a time scale of hours, which is very reminiscent of a standard atoll track containing an island, and lower and upper banana branch. However, both count rate and power spectral properties vary along this track in a very unusual way, not seen in any other atoll or Z source. The count rate, which varied by a factor of ~1.6, along a given track first decreases and then increases, causing the motion through the HIDs to be in the opposite sense to that in the CD, contrary to all other Z and atoll sources. Along a CD track, the very low frequency noise uniquely decreases in amplitude from ~5 to ~2% (rms). The high frequency noise amplitude decreases from ~4% to less than 1% and its characteristic frequency decreases from ~10 to \~5 Hz. The 57-69 Hz quasi-periodic oscillation (QP

Author

Schnerr, R. S.; Reerink, T.; van der Klis, M.; Homan, J.; Méndez, M.; Fender, R. P.; Kuulkers, E.

Published

2003

Language

EN