Observations of IGR J00291+5934 in quiescence

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dc.creatorJonker, P. G.
dc.creatorTorres, M. A. P.
dc.creatorSteeghs, D.
dc.date2008-02-17
dc.date.accessioned2026-07-07T09:21:28Z
dc.date.available2026-07-07T09:21:28Z
dc.descriptionWe report on optical and X-ray observations of the accretion powered ms pulsar IGR J00291+5934 in quiescence. Time resolved I-band photometry has been obtained with the 4.2 m William Herschel Telescope, while a 3 ks Chandra observation provided contemporaneous X-ray coverage. We found an unabsorbed 0.5-10 keV X-ray flux of 1x10^-13 erg cm-2 s-1 which implies that the source was in quiescence at the time of the optical observations. Nevertheless, the optical I-band light curve of IGR J00291+5934 shows evidence for strong flaring. After removal of the strongest flares, we find evidence for an orbital modulation in the phase folded I-band light curve. The overall modulation can be described by effects resulting from the presence of a superhump. Comparing our lightcurve with that reported recently we find evidence for a change in the quiescent base level. Similar changes have now been reported for 4 soft X-ray transients implying that they may be a common feature of such systems in quiescence. Furthermore, the maximum in our folded lightcurve occurs at a different phase than observed before.
dc.description5 pages, 5 figures, accepted for publication in ApJ, uses emulateapj
dc.identifierhttps://arxiv.org/abs/0802.2394
dc.identifierhttp://arxiv.org/abs/0802.2394
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/155036
dc.subjectAstrophysics
dc.titleObservations of IGR J00291+5934 in quiescence
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