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Type I X-ray bursts, burst oscillations and kHz quasi-periodic oscillations in the neutron star system IGR J17191-2821

We present a detailed study of the X-ray energy and power spectral properties of the neutron star transient IGR J17191-2821. We discovered four instances of pairs of simultaneous kilohertz quasi-periodic oscillations (kHz QPOs). The frequency difference between these kHz QPOs is between 315 Hz and 362 Hz. We also report on the detection of five thermonuclear type-I X-ray bursts and the discovery of burst oscillations at ~294 Hz during three of them. Finally, we report on a faint and short outburst precursor, which occurred about two months before the main outburst. Our results on the broadband spectral and variability properties allow us to firmly establish the atoll source nature of IGR J17191-2821.

preprint2009arXivOpen access
D. AltamiranoM. LinaresA. PatrunoN. DegenaarR. WijnandsM. Klein-WoltM. van der KlisC. MarkwardtJ. Swank
astro-ph.HE
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D. AltamiranoM. LinaresA. PatrunoN. DegenaarR. WijnandsM. Klein-WoltM. van der KlisC. MarkwardtJ. Swank

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