Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-05-06
Mon.Not.Roy.Astron.Soc.379:247-252,2007
Astronomy and Astrophysics
Astrophysics
7 pages, 6 figures, accepted for publication on MNRAS
Scientific paper
10.1111/j.1365-2966.2007.11943.x
We have monitored the atoll-type neutron star low-mass X-ray binary 4U 1636-53 with the Rossi X-Ray Timing Explorer (RXTE) for more than 1.5 years. Our campaign consisted of short (~2 ks) pointings separated by two days, regularly monitoring the spectral and timing properties of the source. During the campaign we observed a clear long-term oscillation with a period of ~30-40 days, already seen in the light curves from the RXTE All-Sky Monitor, which corresponded to regular transitions between the hard (island) and soft (banana) states. We detected kHz QPOs in about a third of the observations, most of which were in the soft (banana) state. The distribution of the frequencies of the peak identified as the lower kHz QPO is found to be different from that previously observed in an independent data set. This suggests that the kHz QPOs in the system shows no intrinsically preferred frequency.
Belloni Tomaso
Homan Jeroen
Méndez Mariano
Motta Sara
Ratti Eva
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